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Gold

goldZum Golde drängt, am Golde hängt doch alles.
For gold contend, On gold depend All things.

J. W. Goethe, Faust I

The element gold has many personalities, of which the image of a noble but soft, yellow metal would first across one's mind. The recently discovered nanoparticles and nanowires containing gold are a natural extension of this aspect, as are the uses of gold in electronics and decoration. Thought to be noble, gold actually has a rich chemistry. Fascinating in its complexity for academic chemists, this chemistry has potential applications in materials science, medicine and, recently, in both heterogeneous and homogeneous catalysis. Some fresh promises are related to the optical properties of certain gold compounds or to the possibility of forming new nanostructures based on gold. The unique properties of gold are strongly influenced by relativistic effects.

[1] P. Pyykkö, Theoretical Chemistry of Gold
Angew. Chem. 2004, 116, 4512–4557; Angew. Chem. Int. Ed. 2004, 43, 4412–4456

[2] A. S. K. Hashmi, The Catalysis Gold Rush: New Claims
Angew. Chem. 2005, 117, 7150; Angew. Chem. Int. Ed. 2005, 44, 6990

[3] G. Schmid, B. Corain, Nanoparticulated Gold: Syntheses, Structures, Electronics, and Reactivities
Eur. J. Inorg. Chem. 2003, 3081

Recent Articles

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Combined Positron Emission Tomography and Cerenkov Luminescence Imaging of Sentinel Lymph Nodes Using PEGylated Radionuclide-Embedded Gold Nanoparticles

Combined Positron Emission Tomography and Cerenkov Luminescence Imaging of Sentinel Lymph Nodes Using PEGylated Radionuclide‐Embedded Gold Nanoparticles

PEGylated radionuclide-embedded gold nanoparticles with excellent sensitivity and stability as new multimodal imaging platform are successfully applied to detect sentinel lymph nodes by the use of combined positron emission tomography and Cerenkov luminescence imaging, suggesting the strong feasibility of PEG-RIe-AuNPs as potential lymphatic tracers in the clinical setting.

[Full Paper]
Sang Bong Lee, GhilSuk Sook Yoon, Sang-Woo Lee, Shin Young Jeong, Byeong-Cheol Ahn, Dong-Kwon Lim, Jaetae Lee, Yong Hyun Jeon
Small, July 21, 2016, DOI: 10.1002/smll.201601721. Read article

Local Geometric Effects on Stability and Energy Gap of Thiolate-Protected Gold Nanoparticles

Local Geometric Effects on Stability and Energy Gap of Thiolate‐Protected Gold Nanoparticles

Experiment meets theory: Thiolate-protected gold nanoclusters, Aum(SR)n, have potential applications in many fields due to their high stability and remarkable electronic properties. Through DFT calculations, including nonlocal many-body dispersion interactions, the geometric and electronic properties of Aum(SR)n clusters are investigated to determine the stability and HOMO–LUMO gaps of these clusters (see figure

[Article]
YiFan Bu, Ming Zhao, Yuquan He, Wang Gao, Qing Jiang
ChemPhysChem, July 21, 2016, DOI: 10.1002/cphc.201600539. Read article

Direct Observation of the Collision of Single Pt Nanoparticles onto Single-Crystalline Gold Nanowire Electrodes

Direct Observation of the Collision of Single Pt Nanoparticles onto Single‐Crystalline Gold Nanowire Electrodes

Nanoparticle and nanowire electrode: The collision of single Pt nanoparticles onto an Au nanowire electrode was observed by using electrocatalytic amplification. Previously, such observations had typically been performed by using a microscale disk-type ultramicroelectrode. The use of a nanowire electrode decreased the background noise current and provided a shielding effect, owing to adsorption of the NPs onto the insulating sheath.

[Full Paper]
Changhwan Shin, Hyeonhu Bae, Mijeong Kang, Bongsoo Kim, Seong Jung Kwon
Chem. Asian J., July 21, 2016, DOI: 10.1002/asia.201600630. Read article

Electrocatalytic Oxidation of Alcohols, Tripropylamine, and DNA with Ligand-Free Gold Nanoclusters on Nitrided Carbon

Electrocatalytic Oxidation of Alcohols, Tripropylamine, and DNA with Ligand‐Free Gold Nanoclusters on Nitrided Carbon

Good as gold: Ligand-free Au nanoclusters supported on nitrided carbon nanoparticles and assembled into layer-by-layer films of {PDDA/AuNCs@N-C}n are found to be highly active for the electrocatalytic oxidation of alcohols, an amine, and DNA.

[Article]
Huiqin Yao, Ben Liu, Islam M. Mosa, Itti Bist, Jie He, James F. Rusling
ChemElectroChem, July 20, 2016, DOI: 10.1002/celc.201600283. Read article

Synthesis of α-Fluoroketones by Insertion of HF into a Gold Carbene

Synthesis of α‐Fluoroketones by Insertion of HF into a Gold Carbene

An HF insert: Insertion of hydrogen fluoride (HF) into a metal carbene is a new approach in transition metal catalyzed fluorination and provides an efficient synthesis of α-fluoroketones. This method gives excellent chemical yields for wide range of alkyne substrates.

[Communication]
Xiaojun Zeng, Shiwen Liu, Zhenyu Shi, Guangchang Liu, Bo Xu
Angew. Chem. Int. Ed., July 20, 2016, DOI: 10.1002/anie.201603914. Read article

Detection of Thiols by o-Quinone Nanocomposite Modified Electrodes

Detection of Thiols by o‐Quinone Nanocomposite Modified Electrodes

[Full Paper]
Amila M. Devasurendra, Tianxia Zhu, Jon R. Kirchhoff
Electroanalysis, July 19, 2016, DOI: 10.1002/elan.201600334. Read article

Tuning Gold Nanoparticle Aggregation through the Inhibition of Acid Phosphatase Bioactivity: A Plasmonic Sensor for Light-up Visual Detection of Arsenate (AsV)

We demonstrate a plasmonic biosensor for arsenate, by using gold nanoparticles (AuNPs) as signal reporter and engineering acid phosphatase (AcP) biocatalytic activity by the target ion. The enzyme catalyzes the hydrolysis of negatively charged adenosine 5'-monophosphate (AMP) to neutral adenosine, causing appreciable aggregation of AuNPs and then visible color change of solution from red to blue. In the presence of arsenate (AsV), as a molecular analogue of phosphate, it can effectively interfere with the bioactivity of AcP by competitive inhibition, and so the hydrolysis process is slowed down, mirrored by the observation of solution color from blue to red with increasing the concentration of AsV. Compared to those AuNPs-based sensors for arsenic (basically AsIII) that employ the strong interaction between AsIII-specific molecules and AsIII, this sensor adopts a different sensing principle and represents the first demonstration of visible sensor for AsV specifically with using AuNPs. Finally the practical assay of AsV in groundwater and lake water was performed with satisfactory results, suggesting this approach can be used for quantification of AsV levels in real water samples.

[Communication]
Jia Zhang, Chuan-Ling Zhang, Shu-Hong Yu
ChemPlusChem, July 19, 2016, DOI: 10.1002/cplu.201600355. Read article

Electro-assisted Deposition of Binary Self-Assembled 1,2-Dithiolane Monolayers on Gold with Predictable Composition

Electro‐assisted Deposition of Binary Self‐Assembled 1,2‐Dithiolane Monolayers on Gold with Predictable Composition

SAM forecast: An electro-assisted method is applied to control and predict the chemical composition of functional binary self-assembled monolayers (SAMs) on gold surfaces. Similar ratios of adsorbate molecules in solution and in the monolayers are thus scheduled.

[Article]
Dany Capitao, Rihab Sahli, Noureddine Raouafi, Benoit Limoges, Claire Fave, Bernd Schöllhorn
ChemElectroChem, July 19, 2016, DOI: 10.1002/celc.201600260. Read article

An Efficient Synthesis of Benzazocines by Gold(I)-Catalyzed Tandem 1,2-Acyloxy Shift/[3+2] Cycloaddition of Terminal 1,9-Enynyl Esters

An Efficient Synthesis of Benzazocines by Gold(I)‐Catalyzed Tandem 1,2‐Acyloxy Shift/[3+2] Cycloaddition of Terminal 1,9‐Enynyl Esters

Public N-emy: The synthesis of structurally diverse benzazocines is accomplished in yields of 55–82 % through a gold(I)-catalyzed cascade reaction involving the tandem 1,2-acyloxy shift/[3+2] cycloaddition of terminal 1,9-enynyl esters. The reaction proceeds under extremely mild conditions and represents one of the relatively few transition-metal-catalyzed intramolecular cycloaddition reactions for benzazocine synthesis. Ts=4-MeC6H4SO2.

[Full Paper]
Shangbiao Feng, Zhengshen Wang, Weiwei Zhang, Xingang Xie, Xuegong She
Chem. Asian J., July 19, 2016, DOI: 10.1002/asia.201600593. Read article

Gold Nanowire Fabrication with Surface-Attached Lipid Nanotube Templates

Gold Nanowire Fabrication with Surface‐Attached Lipid Nanotube Templates

A high-throughput approach to fabricate gold nanowires on surfaces with a lipid nanotube (LNT) template is demonstrated. Biotin-tagged LNTs are formed on polymer-coated surfaces from lipid blocks in inverted hexagonal phase, allowing streptavidin-coated gold nanoparticles to attach. The gold nanoparticle-encapsulated LNTs are chemically fixed, dried, and treated with oxygen plasma to remove the lipid template and connect the particles.

[Full Paper]
Kristina Jajcevic, Mohamed Chami, Kaori Sugihara
Small, July 15, 2016, DOI: 10.1002/smll.201600431. Read article

Deposition of Gold Nanoparticles on Niobium Pentoxide with Different Crystal Structures for Room-Temperature Carbon Monoxide Oxidation

Deposition of Gold Nanoparticles on Niobium Pentoxide with Different Crystal Structures for Room‐Temperature Carbon Monoxide Oxidation

Gold medal: Gold nanoparticles are deposited on an acidic support (Nb2O5). The temperature required for 50 % CO conversion is 11 °C for the 1 wt % Au/Nb2O5 (deformed orthorhombic) catalyst prepared by the sol immobilization method, and the CO conversion is 91 % at 28 °C. This simple Au/Nb2O5 catalyst will expand the use of gold catalysts to acidic supports and give rise to new applications.

[Communication]
Toru Murayama, Wataru Ueda, Masatake Haruta
ChemCatChem, July 14, 2016, DOI: 10.1002/cctc.201600563. Read article

Preparation of Triazole Gold(III) Complex as an Effective Catalyst for the Synthesis of E-α-Haloenones

Preparation of Triazole Gold(III) Complex as an Effective Catalyst for the Synthesis of E-α-Haloenones

[Communication]
Yongchun Yang, Wenkang Hu, Xiaohan Ye, Dawei Wang, Xiaodong Shi
Adv. Synth. Catal., July 12, 2016, DOI: 10.1002/adsc.201600243. Read article.

Tetrachloromethane as an Effective Agent to Transform Nanoparticles of Palladium and Gold in Supported Catalysts

Tetrachloromethane as an Effective Agent to Transform Nanoparticles of Palladium and Gold in Supported Catalysts

Phase to phase: CCl4 is an effective medium to generate important phase changes in supported Pd and Au catalysts. The dissolution of carbon that originates from CCl4 to form a PdC0.13 solid solution is more complete for the lowest temperature of the CCl4+H2 reaction (30–50 °C). At higher temperatures, the bulk carbiding competes with the hydrogenative removal of bare carbon species to contribute to an enhanced CH4 and C2H6 formation.

[Communication]
Magdalena Bonarowska, Zbigniew Kaszkur, Grzegorz Słowik, Janusz Ryczkowski, Zbigniew Karpiński
ChemCatChem, July 08, 2016, DOI: 10.1002/cctc.201600605. Read article

Metabolic Characteristics of 16HBE and A549 Cells Exposed to Different Surface Modified Gold Nanorods

Metabolic Characteristics of 16HBE and A549 Cells Exposed to Different Surface Modified Gold Nanorods

Gold Nanorods (AuNRs) with different surface modification induce distinct metabolic consequences to cancer and noncancer cells. PEI-AuNRs show specific cytotoxiciy to A549 cancer cells companied with large disruptions to the cell metabolisms such as energy metabolism, choline metabolism, hexosamine biosynthesis pathway, and oxidative stress to cells. Comprehensive molecular information of different surface modified AuNRs can be valuable in designing purpose-driven AuNRs.

[Full Paper]
Zhigang Liu, Liming Wang, Limin Zhang, Xiaochun Wu, Guangjun Nie, Chunying Chen, Huiru Tang, Yulan Wang
Adv. Healthcare Mater., July 08, 2016, DOI: 10.1002/adhm.201600164. Read article

Nanoporous Gold Bowls: A Kinetic Approach to Control Open Shell Structures and Size-Tunable Lattice Strain for Electrocatalytic Applications

Nanoporous Gold Bowls: A Kinetic Approach to Control Open Shell Structures and Size‐Tunable Lattice Strain for Electrocatalytic Applications

“Bowl-like” nanoporous gold nanoparticles (NPGBs) are synthesized using a seed-mediated approach with precise control over their ligament sizes between 6 and 46 nm. Combining the enormous lattice strain imparted by sub-10 nm ligament with high reactant accessibility intrinsic to open-structure morphology, NPGBs enable ≈9-fold and 3-fold superior catalytic performance compared to 8 nm Au sphere and 2D nanoporous gold sheets, respectively.

[Full Paper]
Srikanth Pedireddy, Hiang Kwee Lee, Charlynn Sher Lin Koh, Joel Ming Rui Tan, Weng Weei Tjiu, Xing Yi Ling
Small, July 07, 2016, DOI: 10.1002/smll.201601371. Read article

An Evaluation of Electron Donation as a Mechanism of the Stabilization of the Chalcogenate-Protected Gold Nanoclusters

The models based on Au(111) face have been extensively employed to describe self-assembled monolayers (SAMs), as well nanoparticles and nanoclusters. However, for very small clusters (<2 nm), the chemisorption of ligands leads to a surface reconstruction, making necessary the use of a more reliable model, able to retrieve the main electronic and geometrical features of these small systems. In the present work, a simple model to describe geometries and the metal-ligand bonding situation in chalcogenate-protected gold nanoclusters is proposed. Three different models (i-iii), in which Aun+ and [XCH3]- (n = 10, 15, 19, 22 and X = S, Se, Te) are employed. The obtained structures are in close agreement not only with the available crystallographic data, but also with much more expensive computational procedures, confirming that the proposed models are robust enough to describe the metal-ligand bonding. The results reveal that the Au-X distances are dependent on both the nature of the chalcogen and the coordination mode. The shortest Au-X distances are observed in the face-centred cubic (FCC) mode, indicating that the central gold atom seems to play a role in the adsorption strength. The proposed models show unambiguously the presence of a chalcogen to cluster sigma-donation, as supported by EDA-NOCV and NBO analyses. In all cases, the metal-ligand interations are characterized as being more covalent than electrostatic.

[Article]
Maximiliano Segala, Felipe Schneider, Giovanni Caramori, Renato L. T. Perreira
ChemPhysChem, July 07, 2016, DOI: 10.1002/cphc.201600552. Read article

Polydopamine-Functionalized Graphene Oxide Loaded with Gold Nanostars and Doxorubicin for Combined Photothermal and Chemotherapy of Metastatic Breast Cancer

Polydopamine‐Functionalized Graphene Oxide Loaded with Gold Nanostars and Doxorubicin for Combined Photothermal and Chemotherapy of Metastatic Breast Cancer

A gold nanostars (GNS) and doxorubicin (DOX) coloaded nanosized reduced graphene oxide (NRGO)-GNS@DOX platform is developed for efficient chemo- and photothermal treatment of breast cancer. The antitumor studies using a metastatic 4T1 breast tumor model demonstrate that a combination of NRGO-GNS@DOX with localized laser irradiation can simultaneously reduce the growth of the primary tumors and suppress their distant metastasis.

[Full Paper]
Fengyang Wang, Qianqian Sun, Bing Feng, Zhiai Xu, Junying Zhang, Jie Xu, Linlin Lu, Haijun Yu, Mingwei Wang, Yaping Li, Wen Zhang
Adv. Healthcare Mater., July 05, 2016, DOI: 10.1002/adhm.201600283. Read article

Probing the Microporous Structure of Silica Shell Via Aggregation-Induced Emission in Au(I)-Thiolate@SiO2 Nanoparticle

Probing the Microporous Structure of Silica Shell Via Aggregation‐Induced Emission in Au(I)‐Thiolate@SiO2 Nanoparticle

An efficient method to investigate the window size of the silica shell generated via the classical Stöber method is reported by making use of the unique aggregation-induced emission property of Au(I)-thiolate complexes, which can precisely probe the porosity of the silica shell in Au(I)-thiolate@SiO2 nanoparticles.

[Communication]
Tingting Zhao, Nirmal Goswami, Jingguo Li, Qiaofeng Yao, Yan Zhang, John Wang, Dan Zhao, Jianping Xie
Small, July 04, 2016, DOI: 10.1002/smll.201601420. Read article

Plasmon Modes Induced by Anisotropic Gap Opening in Au@Cu2O Nanorods

Plasmon Modes Induced by Anisotropic Gap Opening in Au@Cu2O Nanorods

(Gold nanorod core)@(cuprous oxide shell) nanostructures are synthesized by epitaxially coating cuprous oxide on as-grown or oxidized gold nanorods. The nanostructures produced from as-grown gold nanorods possess two transverse plasmon modes, whereas those from oxidized ones exhibit only one transverse plasmon mode. The extra mode is understood to arise from a discontinuous gap at the side of as-grown gold nanorods.

[Full Paper]
Shouren Zhang, Ruibin Jiang, Yanzhen Guo, Baocheng Yang, Xiao-Lan Chen, Jianfang Wang, Yufen Zhao
Small, July 04, 2016, DOI: 10.1002/smll.201600065. Read article

Exploring Collective Substituent Effects: Dependence of the Lifetime of Charged States of Au25(SCnH2n+1)18 Nanoclusters on the Length of the Thiolate Ligands

Exploring Collective Substituent Effects: Dependence of the Lifetime of Charged States of Au25(SCnH2n+1)18 Nanoclusters on the Length of the Thiolate Ligands

[Full Paper]
Sabrina Antonello, Tiziano Dainese, Flavio Maran
Electroanalysis, June 30, 2016, DOI: 10.1002/elan.201600323. Read article

Insights into the Interface Between the Electrolytic Solution and the Gold Core in Molecular Au25 Clusters

Insights into the Interface Between the Electrolytic Solution and the Gold Core in Molecular Au25 Clusters

Gold standard: A large series of Au25(SCnH2n+1)180 clusters is used to study the effect of ligand length on redox potentials. Use of the concentric-capacitor model shows that the average dielectric constant of the monolayer is significantly larger than that of the ligand chains. Its value depends on the number of carbon atoms of the ligand and is the result of contributions from ligands, solvent, and electrolyte.

[Article]
Sabrina Antonello, Tiziano Dainese, Marco De Nardi, Lorena Perotti, Flavio Maran
ChemElectroChem, June 29, 2016, DOI: 10.1002/celc.201600276. Read article

Advances in Gold Catalysis and Understanding the Catalytic Mechanism

Advances in Gold Catalysis and Understanding the Catalytic Mechanism

Au nanocluster catalysts exhibit remarkable catalytic activities for several reactions. The emphasis here is on our research into the development of preparation methods, their characterization, theoretical calculations, and application in catalysis. We share our insight into the interplay between them.

[Personal Account]
Tamao Ishida, Hiroaki Koga, Mitsutaka Okumura, Masatake Haruta
The Chemical Record, June 27, 2016, DOI: 10.1002/tcr.201600046. Read article

Non-enzymatic Electrochemical Oxidation Based on Au NP/PPy/rGO Nanohybrid Modified Glassy Carbon Electrode as a Sensing Platform for Oxalic Acid

Non‐enzymatic Electrochemical Oxidation Based on Au NP/PPy/rGO Nanohybrid Modified Glassy Carbon Electrode as a Sensing Platform for Oxalic Acid

[Full Paper]
Pratigya Sharma, Sivaprakasam Radhakrishnan, Santhana Sivabalan Jayaseelan, Byoung-Suhk Kim
Electroanalysis, June 27, 2016, DOI: 10.1002/elan.201600266. Read article

Side Effect of Good's Buffers on Optical Properties of Gold Nanoparticle Solutions

Side Effect of Good's Buffers on Optical Properties of Gold Nanoparticle Solutions

Obscured view: Systematic optical and electrochemical investigation shows that compounds formed by catalytic degradation of by-products from gold nanoparticle synthesis obscures the optical characterization of gold nanoclusters.

[Article]
Christian Engelbrekt, Michal Wagner, Mikkel Undall-Behrend Christiansen, Hans Erik Mølager Christensen, Xiuzhen Qian, Jens Ulstrup, Chongjun Zhao, Jingdong Zhang
ChemElectroChem, June 27, 2016, DOI: 10.1002/celc.201600135. Read article

Effective Targeted Photothermal Ablation of Multidrug Resistant Bacteria and Their Biofilms with NIR-Absorbing Gold Nanocrosses

Effective Targeted Photothermal Ablation of Multidrug Resistant Bacteria and Their Biofilms with NIR‐Absorbing Gold Nanocrosses

Multiple branched gold nanostructures with strong near-infrared absorption are synthesized and conjugated with primary and secondary antibodies for effective targeted photothermal ablation of multidrug-resistant bacteria, which have become increasingly difficult to be treated with clinically available antibiotics. This method improves the efficiency in eliminating bacteria/biofilms and offers flexibility by changing the corresponding primary antibodies to target other bacteria strains.

[Full Paper]
Choon Peng Teng, Tielin Zhou, Enyi Ye, Shuhua Liu, Leng Duei Koh, Michelle Low, Xian Jun Loh, Khin Yin Win, Lianhui Zhang, Ming-Yong Han
Adv. Healthcare Mater., June 23, 2016, DOI: 10.1002/adhm.201600346. Read article

Improved Hydrogen Production of Au–Pt–CdS Hetero-Nanostructures by Efficient Plasmon-Induced Multipathway Electron Transfer

Improved Hydrogen Production of Au–Pt–CdS Hetero‐Nanostructures by Efficient Plasmon‐Induced Multipathway Electron Transfer

A well-controlled synthetic strategy is developed to selectively grow Pt nanoparticles on the tips of Au nanotriangles and coat a CdS layer along the sides. The as-prepared Au–Pt–CdS hybrids combine a plasmon-enhanced local field with visible to NIR light-harvesting and an efficient multipathway electron transfer, resulting in excellent photocatalytic activity for hydrogen production.

[Full Paper]
Liang Ma, Kai Chen, Fan Nan, Jia-Hong Wang, Da-Jie Yang, Li Zhou, Qu-Quan Wang
Adv. Funct. Mater., June 22, 2016, DOI: 10.1002/adfm.201601651. Read article

Gold Nanoparticle Cluster Arrays for High-Performance SERS Substrates Fabricated by Electro-oxidative Lithography

Gold Nanoparticle Cluster Arrays for High‐Performance SERS Substrates Fabricated by Electro‐oxidative Lithography

A high-performance SERS substrate was fabricated by combining electro-oxidative lithography and self-assembly procedures. High SERS enhancement factors of 5×106 with good reproducibility were achieved by the interparticle and the intercluster plasmon coupling of the Au nanoparticle cluster arrays.

[Communication]
He Liu, Almut M. Schwenke, Florian Kretschmer, Stephanie Hoeppener, Ulrich S. Schubert
ChemNanoMat, June 03, 2016, DOI: 10.1002/cnma.201600063. Read article

Carbon Monoxide: A Mild and Efficient Reducing Agent towards Atomically Precise Gold Nanoclusters

Carbon Monoxide: A Mild and Efficient Reducing Agent towards Atomically Precise Gold Nanoclusters

Carbon monoxide is a mild reducing agent that could provide a good platform to synthesize gold nanoclusters with atomic precision and tunable sizes. CO could also slow down the formation of gold nanoclusters and facilitate the investigation of the formation mechanism of thiolated gold nanoclusters.

[Personal Account]
Tiankai Chen, Jianping Xie
The Chemical Record, June 02, 2016, DOI: 10.1002/tcr.201600004. Read article

Advances in Transition-Metal-Catalysed Alkyne Hydroarylations

Advances in Transition‐Metal‐Catalysed Alkyne Hydroarylations

Cheaper control: An overview of achievements in the application of late-transition-metal complexes as catalysts for the intermolecular hydroarylation of alkynes is presented herein. The usefulness of complexes of Pd, Pt, or Au with N-heterocyclic carbenes (NHCs), in which the ligand stabilizes the complex and renders the catalytic system more productive, is highlighted. Promoters and reaction media for improved catalytic activity and control of the reaction chemoselectivity are also discussed.

[Personal Account]
Andrea Biffis, Cristina Tubaro, Marco Baron
The Chemical Record, June 02, 2016, DOI: 10.1002/tcr.201500285. Read article

Dopamine-Directed In-Situ and One-Step Synthesis of Au@Ag Core–Shell Nanoparticles Immobilized to a Metal–Organic Framework for Synergistic Catalysis

Dopamine‐Directed In‐Situ and One‐Step Synthesis of Au@Ag Core–Shell Nanoparticles Immobilized to a Metal–Organic Framework for Synergistic Catalysis

There′s a synergy: Bimetallic core–shell Au@Ag NPs were immobilized in MOFs via one-step synthetic route at room temperature by using dopamine (DA) as a moderate reductant to reduce the bimetallic precursors step-by-step spontaneously. The as-formed Au@Ag/MOF composites show a striking synergistic effect for heterogeneous catalysis.

[Communication]
Pengcheng Huang, Wenjie Ma, Ping Yu, Lanqun Mao
Chem. Asian J., June 02, 2016, DOI: 10.1002/asia.201600469. Read article

Efficient Oxygen Reduction Electrocatalysts Based on Gold Nanocluster–Graphene Composites

Efficient Oxygen Reduction Electrocatalysts Based on Gold Nanocluster–Graphene Composites

Cause and effect: The porous structures in gold nanocluster–graphene composite (Au25–rGO) electrodes provide a confined space and increase the residence time of O2 on the surface, facilitating the sluggish oxygen reduction reaction (ORR). The ORR at the Au25–rGO electrode proceeds by an efficient four-electron transfer pathway to form H2O, whereas the two-electron pathway to H2O2 is favored at a Au25-modified electrode.

[Article]
Kyuju Kwak, Uday Pratap Azad, Woojun Choi, Kyunglim Pyo, Mi Jang, Dongil Lee
ChemElectroChem, May 25, 2016, DOI: 10.1002/celc.201600154. Read article

Synthesis and Catalytic Activity of Gold Nanoparticles Supported on Dendrimeric Nanocellulose Hybrids

Synthesis and Catalytic Activity of Gold Nanoparticles Supported on Dendrimeric Nanocellulose Hybrids

Alkynyl-dendrons of the PAMAM family were covalently attached to azide-linked cellulose nanocrystals using click chemistry and then used as templates for the preparation of stable and monodispersed gold nanoparticles in aqueous media. The new materials were evaluated as catalysts for the reduction of 4-nitrophenyl and displayed enhanced activity relative to other supported AuNPs.

[Full Paper]
Ana Herreros-López, Caroline Hadad, Luis Yate, Ali A. Alshatwi, Nicola Vicentini, Tommaso Carofiglio, Maurizio Prato
Eur. J. Org. Chem., April 27, 2016, DOI: 10.1002/ejoc.201600148. Read article.

Synthesis of Gold(I) Derivatives Bearing Alkylated 1,3,5-Triaza-7-phosphaadamantane as Selective Anticancer Metallodrugs

Synthesis of Gold(I) Derivatives Bearing Alkylated 1,3,5-Triaza-7-phosphaadamantane as Selective Anticancer Metallodrugs

The preparation of new water-soluble mono- and bis-phosphanes derived from 1,3,5-triaza-7-phosphaadamantane (PTA) is described. Antiproliferative effects against colon cancer cell lines and low cytotoxicity towards differentiated cells (non-carcinogenic) have been observed for some of the gold complexes formed with these phosphanes.

[Full Paper]
Elena Atrián-Blasco, Sonia Gascón, M. Jesús Rodríguez-Yoldi, Mariano Laguna, Elena Cerrada
Eur. J. Inorg. Chem., April 24, 2016, DOI: 10.1002/ejic.201600177. Read article.

Exploiting Metallophilicity for the Assembly of Inorganic Nanocrystals and Conjugated Organic Molecules

Exploiting Metallophilicity for the Assembly of Inorganic Nanocrystals and Conjugated Organic Molecules

Interface design: A new source of interface interaction based on metal–metal bonds is presented. An organometallic gelator is used for the formation of hydrogel-like nanocomposites (NCPs) embedding inorganic nanoparticles and conjugated organic molecules. The establishment of metallophilic interactions at the interface between the two moieties greatly enhances the interparticle coupling, as evidenced in the case of plasmonic nanoparticles. Au-OLAm NPs: oleylamine-capped Au nanoparticles.

[Article]
Mariona Dalmases, Elisabet Aguiló, Jordi Llorca, Laura Rodríguez, Albert Figuerola
ChemPhysChem, April 20, 2016, DOI: 10.1002/cphc.201600239. Read article

Nanosecond Time-Resolution Study of Gold Nanorod Rotation at the Liquid–Solid Interface

Nanosecond Time‐Resolution Study of Gold Nanorod Rotation at the Liquid–Solid Interface

In a spin: A nanosecond time-resolution study yields new insights into the rotational motion of anchored rod-like nanoparticles at the liquid–solid interface. The continuous rotation observed under low temporal resolution is found to be comprised of numerous fast, intermittent transitions between a limited number of weakly immobilized states.

[Article]
Bhanu Neupane, Fang Chen, Yanli Wei, Ning Fang, Frances S. Ligler, Gufeng Wang
ChemPhysChem, April 20, 2016, DOI: 10.1002/cphc.201600174. Read article

Ultrafine Au and Ag Nanoparticles Synthesized from Self-Assembled Peptide Fibers and Their Excellent Catalytic Activity

Ultrafine Au and Ag Nanoparticles Synthesized from Self‐Assembled Peptide Fibers and Their Excellent Catalytic Activity

Feeling fine: Three nanomaterials are prepared by using the peptide Ac-FFACD-OH. Induced by Ag+, the peptide can self-assemble to form fibers. Ultrafine AgNPs (NPs=nanoparticles) are reduced in situ by these fibers, so the peptide acts as a stabilizer, reductant, and directing template agent. Ultrafine AgNPs and AuNPs are synthesized by adding NaBH4. All materials show excellent catalytic activity toward 4-nitrophenol (4-NP; see figure) and selective catalytic activity toward dyes.

[Article]
Wenlong Xu, Yue Hong, Yuanyuan Hu, Jingcheng Hao, Aixin Song
ChemPhysChem, April 13, 2016, DOI: 10.1002/cphc.201600182. Read article

Isolable Ethylene Complexes of Copper(I), Silver(I), and Gold(I) Supported by Fluorinated Scorpionates [HB{3-(CF3),5-(CH3)Pz}3] and [HB{3-(CF3),5-(Ph)Pz}3]

Isolable Ethylene Complexes of Copper(I), Silver(I), and Gold(I) Supported by Fluorinated Scorpionates [HB{3-(CF3),5-(CH3)Pz}3]– and [HB{3-(CF3),5-(Ph)Pz}3]–

Partially fluorinated scorpionate [HB{3-(CF3),5-(CH3)Pz}3] allows the stabilization of molecules with gold(I), silver(I) and copper(I) ethylene adducts. Related adducts supported by [HB{3-(CF3),5-(CH3)Pz}3] are also included for comparisons. Notable differences exist in scorpionate modes of coordination and ethylene carbon chemical shift values.

[Communication]
Shawn G. Ridlen, Jiang Wu, Naveen V. Kulkarni, H. V. Rasika Dias
Eur. J. Inorg. Chem., February 9, 2016, DOI: 10.1002/ejic.201501365. Read article.

Detailed Investigation of the Structural, Thermal, and Electronic Properties of Gold Isocyanide Complexes with Mechano-Triggered Single-Crystal-to-Single-Crystal Phase Transitions

Detailed Investigation of the Structural, Thermal, and Electronic Properties of Gold Isocyanide Complexes with Mechano-Triggered Single-Crystal-to-Single-Crystal Phase Transitions

Mechano-induced phase transitions: A detailed investigation of two intriguing gold(I) complexes that show mechano-triggered single-crystal-to-single-crystal (SCSC) phase transitions is described, which includes face index experiments, thermal analyses, and conductivity measurements (see figure). Various hitherto unknown insights into the mechano-responsive molecular crystals have been reported.

[Full Paper]
Tomohiro Seki, Kenta Sakurada, Mai Muromoto, Shu Seki, Hajime Ito
Chem. Eur. J., January 11, 2016, DOI: 10.1002/chem.201503721. Read article.

Co-Adsorption of O2 and CO on Au2: Infrared Photodissociation Spectroscopy and Theoretical Study of [Au2O2(CO)n] (n=2–6)

Co-Adsorption of O2 and CO on Au2−: Infrared Photodissociation Spectroscopy and Theoretical Study of [Au2O2(CO)n]− (n=2–6)

Co-adsorption: The [Au2O2(CO)n] (n=2–6) complexes were prepared through a laser vaporization supersonic ion source and were studied by using infrared photodissociation spectroscopy (see figure). All complexes were characterized to have a core structure involving one CO and one O2 molecule co-adsorbed on Au2 with the other CO molecules physically tagged around.

[Full Paper]
Hao Liu, Xiaopeng Xing, Xuefeng Wang, Hui Qu, Guan-jun Wang, Ming-fei Zhou
Chem. Eur. J., January 8, 2016, DOI: 10.1002/chem.201504384. Read article.

Gold-Catalyzed Tandem Cycloisomerization–Halogenation of Chiral Homopropargyl Sulfonamides

Gold-Catalyzed Tandem Cycloisomerization–Halogenation of Chiral Homopropargyl Sulfonamides

Two new gold-catalyzed tandem cycloisomerization–halogenation reactions of chiral homopropargyl sulfonamides have been developed. Enantioenriched 3,3-diiodopyrrolidin-2-ols and 3-fluoropyrrolidin-2-ols were obtained in moderate-to-good yields with excellent enantio- and diastereocontrol (see scheme; PG=protecting group, DCE=1,2-dichloroethane, NIS=N-iodosuccinimide).

[Full Paper]
Chao Shu, Long Li, Cang-Hai Shen, Peng-Peng Ruan, Chao-Yue Liu, Long-Wu Ye 
Chem. Eur. J., January 8, 2016, DOI: 10.1002/chem.201503891. Read article.

Chemo- and Regioselective Ethynylation of Tryptophan-Containing Peptides and Proteins

Chemo- and Regioselective Ethynylation of Tryptophan-Containing Peptides and Proteins

Alkynes on a gold Tr(i)p! Various peptides and one model protein were functionalized with ethynyl moieties at their tryptophan residues using Waser’s reagent, TIPS-EBX, under gold(I) catalysis (see scheme; TIPS=triisopropylsilyl). The reaction proceeded in a regio- and chemoselective manner leading to C2 substitution at the tryptophan residues only. Subsequently, the terminal alkyne was used to label one of the model peptides with a fluorophore by means of copper-catalyzed click chemistry.

[Communication]
Morten Borre Hansen, František Hubálek, Troels Skrydstrup, Thomas Hoeg-Jensen
Chem. Eur. J., December 22, 2015, DOI: 10.1002/chem.201504462. Read article.

Activation and Transformation of Ethane by Au2VO3+ Clusters with Closed-Shell Electronic Structures

Activation and Transformation of Ethane by Au2VO3+ Clusters with Closed-Shell Electronic Structures

The crucial role of gold in the transformation of ethane to ethene and dihydrogen is observed in the reaction between C2H6 and Au2VO3+ clusters with closed-shell electronic structures. The first C-H activation is initiated by gold rather than an oxygen species. The Au-Au dimer formed during the reactions plays important roles in converting ethane into ethene and making dihydrogen energetically more favorable.

[Full Paper]
Ya-Ke Li, Zi-Yu Li, Yan-Xia Zhao, Qing-Yu Liu, Jing-Heng Meng, Sheng-Gui He
Chem. Eur. J., December 17, 2015, DOI: 10.1002/chem.201503676. Read article.

On the Mechanism of the Digold(I)–Hydroxide-Catalysed Hydrophenoxylation of Alkynes

On the Mechanism of the Digold(I)–Hydroxide-Catalysed Hydrophenoxylation of Alkynes

Gold rush! A series of in silico studies, supported by experimental work, have been carried out to further elucidate the mechanistic aspects of the hydrophenoxylation of alkynes. The results suggest that the synergic cooperation of two mono-gold species facilitates this process, although analogous mono-gold species are not capable of mediating this reaction (see figure).

[Full Paper]
Adrián Gómez-Suárez, Yoshihiro Oonishi, Anthony R. Martin, Sai V. C. Vummaleti, David J. Nelson, David B. Cordes, Alexandra M. Z. Slawin, Luigi Cavallo, Steven P. Nolan, Albert Poater
Chem. Eur. J., December 11, 2015, DOI: 10.1002/chem.201503097. Read article.

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