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Luo Z, Shehzad A. Advances in Naked Metal Clusters for Catalysis. Chemphyschem 2024; 25:e202300715. [PMID: 38450926 DOI: 10.1002/cphc.202300715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 03/06/2024] [Accepted: 03/07/2024] [Indexed: 03/08/2024]
Abstract
The properties of sub-nano metal clusters are governed by quantum confinement and their large surface-to-bulk ratios, atomically precise compositions and geometric/electronic structures. Advances in metal clusters lead to new opportunities in diverse aspects of sciences including chemo-sensing, bio-imaging, photochemistry, and catalysis. Naked metal clusters having synergic multiple active sites and coordinative unsaturation and tunable stability/activity enable researchers to design atomically precise metal catalysts with tailored catalysis for different reactions. Here we summarize the progress of ligand-free naked metal clusters for catalytic applications. It is anticipated that this review helps to better understand the chemistry of small metal clusters and facilitates the design and development of new catalysts for potential applications.
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Affiliation(s)
- Zhixun Luo
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
- School of Chemistry, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Aamir Shehzad
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
- School of Chemistry, University of Chinese Academy of Sciences, Beijing, 100049, China
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2
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Siciliano G, Alsadig A, Chiriacò MS, Turco A, Foscarini A, Ferrara F, Gigli G, Primiceri E. Beyond traditional biosensors: Recent advances in gold nanoparticles modified electrodes for biosensing applications. Talanta 2024; 268:125280. [PMID: 37862755 DOI: 10.1016/j.talanta.2023.125280] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 10/02/2023] [Accepted: 10/05/2023] [Indexed: 10/22/2023]
Abstract
Gold nanoparticles (AuNPs) have emerged as powerful tools in the construction of highly sensitive electrochemical biosensors. Their unique properties, such as the ability to serve as an effective platform for biomolecule immobilization and to facilitate electron transfer between the electrode surface and the immobilized molecules, make them a promising choice for biosensor applications. Utilizing AuNPs modified electrodes can lead to improved sensitivity and lower limits of detection compared to unmodified electrodes. This review provides a comprehensive overview of the recent advancements and applications of AuNPs-based electrochemical biosensors in the biomedical field. The synthesis methods of AuNPs, their key properties, and various strategies employed for electrode modification are discussed. Furthermore, this review highlights the remarkable applications of these nanostructure-integrated electrodes, including immunosensors, enzyme biosensors, and DNA biosensors.
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Affiliation(s)
- Giulia Siciliano
- CNR NANOTEC Institute of Nanotechnology, via Monteroni, 73100 Lecce, Italy
| | - Ahmed Alsadig
- CNR NANOTEC Institute of Nanotechnology, via Monteroni, 73100 Lecce, Italy
| | | | - Antonio Turco
- CNR NANOTEC Institute of Nanotechnology, via Monteroni, 73100 Lecce, Italy
| | - Alessia Foscarini
- CNR NANOTEC Institute of Nanotechnology, via Monteroni, 73100 Lecce, Italy
| | - Francesco Ferrara
- CNR NANOTEC Institute of Nanotechnology, via Monteroni, 73100 Lecce, Italy.
| | - Giuseppe Gigli
- CNR NANOTEC Institute of Nanotechnology, via Monteroni, 73100 Lecce, Italy
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Adnan RH, Madridejos JML, Alotabi AS, Metha GF, Andersson GG. A Review of State of the Art in Phosphine Ligated Gold Clusters and Application in Catalysis. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2105692. [PMID: 35332703 PMCID: PMC9130904 DOI: 10.1002/advs.202105692] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 02/23/2022] [Indexed: 05/28/2023]
Abstract
Atomically precise gold clusters are highly desirable due to their well-defined structure which allows the study of structure-property relationships. In addition, they have potential in technological applications such as nanoscale catalysis. The structural, chemical, electronic, and optical properties of ligated gold clusters are strongly defined by the metal-ligand interaction and type of ligands. This critical feature renders gold-phosphine clusters unique and distinct from other ligand-protected gold clusters. The use of multidentate phosphines enables preparation of varying core sizes and exotic structures beyond regular polyhedrons. Weak gold-phosphorous (Au-P) bonding is advantageous for ligand exchange and removal for specific applications, such as catalysis, without agglomeration. The aim of this review is to provide a unified view of gold-phosphine clusters and to present an in-depth discussion on recent advances and key developments for these clusters. This review features the unique chemistry, structural, electronic, and optical properties of gold-phosphine clusters. Advanced characterization techniques, including synchrotron-based spectroscopy, have unraveled substantial effects of Au-P interaction on the composition-, structure-, and size-dependent properties. State-of-the-art theoretical calculations that reveal insights into experimental findings are also discussed. Finally, a discussion of the application of gold-phosphine clusters in catalysis is presented.
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Affiliation(s)
- Rohul H. Adnan
- Department of Chemistry, Faculty of ScienceCenter for Hydrogen EnergyUniversiti Teknologi Malaysia (UTM)Johor Bahru81310Malaysia
| | | | - Abdulrahman S. Alotabi
- Flinders Institute for NanoScale Science and TechnologyFlinders UniversityAdelaideSouth Australia5042Australia
- Department of PhysicsFaculty of Science and Arts in BaljurashiAlbaha UniversityBaljurashi65655Saudi Arabia
| | - Gregory F. Metha
- Department of ChemistryUniversity of AdelaideAdelaideSouth Australia5005Australia
| | - Gunther G. Andersson
- Flinders Institute for NanoScale Science and TechnologyFlinders UniversityAdelaideSouth Australia5042Australia
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Tetrabutyl Ammonium Salts of Keggin-Type Vanadium-Substituted Phosphomolybdates and Phosphotungstates for Selective Aerobic Catalytic Oxidation of Benzyl Alcohol. Catalysts 2022. [DOI: 10.3390/catal12050507] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A series of tetrabutyl ammonium (TBA) salts of V-included Keggin-type polyoxoanions with W (TBA4PW11V1O40 and TBA5PW10V2O40) and Mo (TBA4PMo11V1O40 and TBA5PMo10V2O40) as addenda atoms were prepared using a hydrothermal method. These synthesized materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflectance (DRS UV-Vis), thermogravimetric analysis (TGA), CHN elemental analysis (EA), inductively coupled plasma spectrometry (ICP-MS), and N2 physisorption techniques to assess their physicochemical/textural properties and correlate them with their catalytic performances. According to FT-IR and DRS UV-Vis, (PVXW(Mo)12−XO40)(3+X)− anions are the main species present in the TBA salts. Additionally, CHN-EA and ICP-MS revealed that the desired stoichiometry was obtained. Their catalytic activities in the liquid-phase aerobic oxidation of benzyl alcohol to benzaldehyde were studied at 5 bar of O2 at 170 °C. Independently of the addenda atom nature, the catalytic activity increased with the number of V in the Keggin anion structure. For both series of catalysts, TBA salts of polyoxometalates with the highest V-substitution degree (TBA5PMo10V2O40 and TBA5PW10V2O40) showed higher activity. The maximum benzyl alcohol conversions obtained were 93% and 97% using (TBA)5PMo10V2O40 and (TBA)5PW10V2O40 as catalysts, respectively. In all the cases, the selectivity toward benzaldehyde was higher than 99%.
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Brindle J, Sufyan SA, Nigra MM. Support, composition, and ligand effects in partial oxidation of benzyl alcohol using gold–copper clusters. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00137c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The effect of metallic composition, support, and ligands on catalytic performance using AuCu clusters in benzyl alcohol oxidation is investigated.
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Affiliation(s)
- Joseph Brindle
- Department of Chemical Engineering, University of Utah, Salt Lake City, Utah 84112, USA
| | - Sayed Abu Sufyan
- Department of Chemical Engineering, University of Utah, Salt Lake City, Utah 84112, USA
| | - Michael M. Nigra
- Department of Chemical Engineering, University of Utah, Salt Lake City, Utah 84112, USA
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Baruah MJ, Bora TJ, Dutta R, Roy S, Guha AK, Bania KK. Fe(III) superoxide radicals in halloysite nanotubes for visible-light-assisted benzyl alcohol oxidation and oxidative C C coupling of 2-naphthol. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111858] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Gold Clusters: From the Dispute on a Gold Chair to the Golden Future of Nanostructures. Molecules 2021; 26:molecules26165014. [PMID: 34443602 PMCID: PMC8399228 DOI: 10.3390/molecules26165014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 08/10/2021] [Accepted: 08/14/2021] [Indexed: 12/14/2022] Open
Abstract
The present work opens with an acknowledgement to the research activity performed by Luciana Naldini while affiliated at the Università degli Studi di Sassari (Italy), in particular towards gold complexes and clusters, as a tribute to her outstanding figure in a time and a society where being a woman in science was rather difficult, hoping her achievements could be of inspiration to young female chemists in pursuing their careers against the many hurdles they may encounter. Naldini’s findings will be a key to introduce the most recent results in this field, showing how the chemistry of gold compounds has changed throughout the years, to reach levels of complexity and elegance that were once unimagined. The study of gold complexes and clusters with various phosphine ligands was Naldini’s main field of research because of the potential application of these species in diverse research areas including electronics, catalysis, and medicine. As the conclusion of a vital period of study, here we report Naldini’s last results on a hexanuclear cationic gold cluster, [(PPh3)6Au6(OH)2]2+, having a chair conformation, and on the assumption, supported by experimental data, that it comprises two hydroxyl groups. This contribution, within the fascinating field of inorganic chemistry, provides the intuition of how a simple electron counting may lead to predictable species of yet unknown molecular architectures and formulation, nowadays suggesting interesting opportunities to tune the electronic structures of similar and higher nuclearity species thanks to new spectroscopic and analytical approaches and software facilities. After several decades since Naldini’s exceptional work, the chemistry of the gold cluster has reached a considerable degree of complexity, dealing with new, single-atom precise, materials possessing interesting physico-chemical properties, such as luminescence, chirality, or paramagnetic behavior. Here we will describe some of the most significant contributions.
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Matsuyama T, Kikkawa S, Fujiki Y, Tsukada M, Takaya H, Yasuda N, Nitta K, Nakatani N, Negishi Y, Yamazoe S. Thermal stability of crown-motif [Au 9(PPh 3) 8] 3+ and [MAu 8(PPh 3) 8] 2+ (M = Pd, Pt) clusters: Effects of gas composition, single-atom doping, and counter anions. J Chem Phys 2021; 155:044307. [PMID: 34340395 DOI: 10.1063/5.0059690] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The thermal behaviors of ligand-protected metal clusters, [Au9(PPh3)8]3+ and [MAu8(PPh3)8]2+ (M = Pd, Pt) with a crown-motif structure, were investigated to determine the effects of the gas composition, single-atom doping, and counter anions on the thermal stability of these clusters. We successfully synthesized crown-motif [PdAu8(PPh3)8][HPMo12O40] (PdAu8-PMo12) and [PtAu8(PPh3)8][HPMo12O40] (PtAu8-PMo12) salts with a cesium-chloride-type structure, which is the same as the [Au9(PPh3)8][PMo12O40] (Au9-PMo12) structure. Thermogravimetry-differential thermal analysis/mass spectrometry analysis revealed that the crown-motif structure of Au9-PMo12 was decomposed at ∼475 K without weight loss to form Au nanoparticles. After structural decomposition, the ligands were desorbed from the sample. The ligand desorption temperature of Au9-PMo12 increased under 20% O2 conditions because of the formation of Au nanoparticles and stronger interaction of the formed O=PPh3 than PPh3. The Pd and Pt single-atom doping improved the thermal stability of the clusters. This improvement was due to the formation of a large bonding index of M-Au and a change in Au-PPh3 bonding energy by heteroatom doping. Moreover, we found that the ligand desorption temperatures were also affected by the type of counter anions, whose charge and size influence the localized Coulomb interaction and cluster packing between the cationic ligand-protected metal clusters and counter anions.
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Affiliation(s)
- Tomoki Matsuyama
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Soichi Kikkawa
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Yu Fujiki
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Mio Tsukada
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Hikaru Takaya
- Institute for Chemical Research, Kyoto University, Gokasho, Uji-city, Kyoto 611-0011, Japan
| | - Nobuhiro Yasuda
- Center for Synchrotron Radiation Research, Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Kiyofumi Nitta
- Center for Synchrotron Radiation Research, Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Naoki Nakatani
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Yuichi Negishi
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Seiji Yamazoe
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions. Catalysts 2021. [DOI: 10.3390/catal11070760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Catalytic efficacy of metal-based catalysts can be significantly enhanced by doping graphene or its derivatives in the catalytic protocol. In continuation of previous work regarding the catalytic properties of highly-reduced graphene oxide (HRG), graphene-oxide (GO) doped mixed metal oxide-based nanocomposites, herein we report a simple, straightforward and solventless mechanochemical preparation of N-doped graphene (NDG)/mixed metal oxide-based nanocomposites of ZnO–MnCO3 (i.e., ZnO–MnCO3/(X%-NDG)), wherein N-doped graphene (NDG) is employed as a dopant. The nanocomposites were prepared by physical milling of separately fabricated NDG and ZnO–MnCO3 calcined at 300 °C through eco-friendly ball mill procedure. The as-obtained samples were characterized via X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), Raman, Field emission scanning electron microscopy (FESEM), Energy-dispersive X-ray spectroscopy (EDX) and surface area analysis techniques. To explore the effectiveness of the obtained materials, liquid-phase dehydrogenation of benzyl alcohol (BOH) to benzaldehyde (BH) was chosen as a benchmark reaction using eco-friendly oxidant (O2) without adding any harmful surfactants or additives. During the systematic investigation of reaction, it was revealed that the ZnO–MnCO3/NDG catalyst exhibited very distinct specific-activity (80 mmol/h.g) with a 100% BOH conversion and <99% selectivity towards BH in a very short time. The mechanochemically synthesized NDG-based nanocomposite showed remarkable enhancement in the catalytic performance and increased surface area compared with the catalyst without graphene (i.e., ZnO–MnCO3). Under the optimum catalytic conditions, the catalyst successfully transformed various aromatic, heterocyclic, allylic, primary, secondary and aliphatic alcohols to their respective ketones and aldehydes with high selectively and convertibility without over-oxidation to acids. In addition, the ZnO–MnCO3/NDG was also recycled up to six times with no apparent loss in its efficacy.
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Khan WU, Yu IKM, Sun Y, Polson MIJ, Golovko V, Lam FLY, Ogino I, Tsang DCW, Yip ACK. Size-activity threshold of titanium dioxide-supported Cu cluster in CO oxidation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 279:116899. [PMID: 33743438 DOI: 10.1016/j.envpol.2021.116899] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/17/2021] [Accepted: 03/02/2021] [Indexed: 06/12/2023]
Abstract
Development of non-noble metal cluster catalysts, aiming at concurrently high activity and stability, for emission control systems has been challenging because of sintering and overcoating of clusters on the support. In this work, we reported the role of well-dispersed copper nanoclusters supported on TiO2 in CO oxidation under industrially relevant operating conditions. The catalyst containing 0.15 wt% Cu on TiO2 (0.15 CT) exhibited a high dispersion (59.1%), a large specific surface area (381 m2/gCu), a small particle size (1.77 nm), and abundant active sites (75.8% Cu2O). The CO oxidation activity measured by the turnover frequency (TOF) was found to be enhanced from 0.60 × 10-3 to 3.22 × 10-3 molCO·molCu-1·s-1 as the copper loading decreased from 5 to 0.15 wt%. A CO conversion of approximately 60% was still observed in the supported cluster catalyst with a Cu loading of 5 wt% at 240 °C. No deactivation was observed for catalysts with low copper loading (0.15 and 0.30 CT) after 8 h of time-on-stream, which compares favorably with less stable Au cluster-based catalysts reported in the literature. In contrast, catalysts with high copper loading (0.75 and 5 CT) showed deactivation over time, which was ascribed to the increase in copper particle size due to metal cluster agglomeration. This study elucidated the size-activity threshold of TiO2-supported Cu cluster catalysts. It also demonstrated the potential of the supported Cu cluster catalyst at a typical temperature range of diesel engines at light-load. The supported Cu cluster catalyst could be a promising alternative to noble metal cluster catalysts for emission control systems.
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Affiliation(s)
- Wasim Ullah Khan
- Department of Chemical and Process Engineering, University of Canterbury, Christchurch, 8140, New Zealand
| | - Iris K M Yu
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China; Department of Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstrasse 4, Garching, 85748, Germany
| | - Yuqing Sun
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Matthew I J Polson
- School of Physical and Chemical Sciences, University of Canterbury, Christchurch, 8140, New Zealand
| | - Vladimir Golovko
- School of Physical and Chemical Sciences, University of Canterbury, Christchurch, 8140, New Zealand
| | - Frank L Y Lam
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Isao Ogino
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
| | - Alex C K Yip
- Department of Chemical and Process Engineering, University of Canterbury, Christchurch, 8140, New Zealand
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Mousavi H, Yin Y, Howard-Fabretto L, Sharma SK, Golovko V, Andersson GG, Shearer CJ, Metha GF. Au 101-rGO nanocomposite: immobilization of phosphine-protected gold nanoclusters on reduced graphene oxide without aggregation. NANOSCALE ADVANCES 2021; 3:1422-1430. [PMID: 36132862 PMCID: PMC9417812 DOI: 10.1039/d0na00927j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 01/07/2021] [Indexed: 05/05/2023]
Abstract
Graphene supported transition metal clusters are of great interest for potential applications, such as catalysis, due to their unique properties. In this work, a simple approach to deposit Au101(PPh3)21Cl5 (Au101NC) on reduced graphene oxide (rGO) via an ex situ method is presented. Reduction of graphene oxide at native pH (pH ≈ 2) to rGO was performed under aqueous hydrothermal conditions. Decoration of rGO sheets with controlled content of 5 wt% Au was accomplished using only pre-synthesised Au101NC and rGO as precursors and methanol as solvent. High resolution scanning transmission electron microscopy indicated that the cluster size did not change upon deposition with an average diameter of 1.4 ± 0.4 nm. It was determined that the rGO reduction method was crucial to avoid agglomeration, with rGO reduced at pH ≈ 11 resulting in agglomeration. X-ray photoelectron spectroscopy was used to confirm the deposition of Au101NCs and show the presence of triphenyl phosphine ligands, which together with attenuated total reflectance Fourier transform infrared spectroscopy, advocates that the deposition of Au101NCs onto the surface of rGO was facilitated via non-covalent interactions with the phenyl groups of the ligands. Inductively coupled plasma mass spectrometry and thermogravimetric analysis were used to determine the gold loading and both agree with a gold loading of ca. 4.8-5 wt%. The presented simple and mild strategy demonstrates that good compatibility between size-specific phosphine protected gold clusters and rGO can prevent aggregation of the metal clusters. This work contributes towards producing an agglomeration-free synthesis of size-specific ligated gold clusters on rGO that could have wide range of applications.
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Affiliation(s)
- Hanieh Mousavi
- Department of Chemistry, University of Adelaide Adelaide SA 5005 Australia
| | - Yanting Yin
- Flinders Centre for NanoScale Science and Technology, Flinders University Adelaide SA 5001 Australia
| | - Liam Howard-Fabretto
- Flinders Centre for NanoScale Science and Technology, Flinders University Adelaide SA 5001 Australia
| | - Shailendra Kumar Sharma
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences, University of Canterbury Christchurch 8140 New Zealand
| | - Vladimir Golovko
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences, University of Canterbury Christchurch 8140 New Zealand
| | - Gunther G Andersson
- Flinders Centre for NanoScale Science and Technology, Flinders University Adelaide SA 5001 Australia
| | - Cameron J Shearer
- Department of Chemistry, University of Adelaide Adelaide SA 5005 Australia
| | - Gregory F Metha
- Department of Chemistry, University of Adelaide Adelaide SA 5005 Australia
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Verma N, Ananthakrishnan R. Boosted Charge Transfer Efficacy of an All‐Solid‐State Z‐Scheme BiOI‐CD‐CdS Photocatalyst for Enhanced Degradation of 4‐Nitrophenol and Oxidation of Benzyl Alcohol under Visible Light**. CHEMPHOTOCHEM 2021. [DOI: 10.1002/cptc.202000280] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Neha Verma
- Department of Chemistry, Environmental Chemistry & Analytical Chemistry Laboratory Indian Institute of Technology Kharagpur 721 302 West Bengal India
| | - Rajakumar Ananthakrishnan
- Department of Chemistry, Environmental Chemistry & Analytical Chemistry Laboratory Indian Institute of Technology Kharagpur 721 302 West Bengal India
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Daughtry J, Alotabi AS, Howard-Fabretto L, Andersson GG. Composition and properties of RF-sputter deposited titanium dioxide thin films. NANOSCALE ADVANCES 2021; 3:1077-1086. [PMID: 36133287 PMCID: PMC9417277 DOI: 10.1039/d0na00861c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 12/07/2020] [Indexed: 06/16/2023]
Abstract
The photocatalytic properties of titania (TiO2) have prompted research utilising its useful ability to convert solar energy into electron-hole pairs to drive novel chemistry. The aim of the present work is to examine the properties required for a synthetic method capable of producing thin TiO2 films, with well defined, easily modifiable characteristics. Presented here is a method of synthesis of TiO2 nanoparticulate thin films generated using RF plasma capable of homogenous depositions with known elemental composition and modifiable properties at a far lower cost than single-crystal TiO2. Multiple depositions regimes were examined for their effect on overall chemical composition and to minimise the unwanted contaminant, carbon, from the final film. The resulting TiO2 films can be easily modified through heating to further induce defects and change the electronic structure, crystallinity, surface morphology and roughness of the deposited thin film.
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Affiliation(s)
- Jesse Daughtry
- Flinders Institute for NanoScale Science and Technology, Flinders University Adelaide SA 5001 Australia
- Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University Adelaide SA 5042 Australia
| | - Abdulrahman S Alotabi
- Flinders Institute for NanoScale Science and Technology, Flinders University Adelaide SA 5001 Australia
- Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University Adelaide SA 5042 Australia
| | - Liam Howard-Fabretto
- Flinders Institute for NanoScale Science and Technology, Flinders University Adelaide SA 5001 Australia
- Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University Adelaide SA 5042 Australia
| | - Gunther G Andersson
- Flinders Institute for NanoScale Science and Technology, Flinders University Adelaide SA 5001 Australia
- Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University Adelaide SA 5042 Australia
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15
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Sharma S, Sharma C, Kaur M, Paul S. The in situ fabrication of ZIF-67 on titania-coated magnetic nanoparticles: a new platform for the immobilization of Pd( ii) with enhanced catalytic activity for organic transformations. NEW J CHEM 2021. [DOI: 10.1039/d1nj03738b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The synthesis of a magnetic zeolitic-imidazolate-framework-67-supported Pd catalyst was demonstrated, and its catalytic activity for oxidation, reduction, and the oxidative deprotection of oximes was studied.
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Affiliation(s)
- Sukanya Sharma
- Department of Chemistry, University of Jammu, Jammu, 180006, India
| | - Chandan Sharma
- Department of Chemistry, University of Jammu, Jammu, 180006, India
| | - Manpreet Kaur
- Department of Chemistry, University of Jammu, Jammu, 180006, India
| | - Satya Paul
- Department of Chemistry, University of Jammu, Jammu, 180006, India
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Lapa HM, Guedes da Silva MFC, Pombeiro AJ, Alegria EC, Martins LM. C-scorpionate Au(III) complexes as pre-catalysts for industrially significant toluene oxidation and benzaldehyde esterification reactions. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119881] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Churipard SR, Kanakikodi KS, Choudhuri JR, Maradur SP. Polyoxotungstate ([PW 11O 39] 7-) immobilized on mesoporous polymer for selective liquid-phase oxidation of alcohols using H 2O 2. RSC Adv 2020; 10:35988-35997. [PMID: 35517088 PMCID: PMC9056987 DOI: 10.1039/d0ra07178a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 09/18/2020] [Indexed: 11/21/2022] Open
Abstract
Selective oxidation of alcohols is an attractive organic transformation and has received tremendous attention from the scientific community over the years. Herein, a mesoporous polymer (MP) was synthesized by a template-free solvothermal approach. The surface of the MP was functionalized with quaternary ammonium groups and polyoxotungstate anion (PW11O397−) was subsequently supported on the MP as a counter anion to the ammonium cation by a simple ion-exchange procedure. The structure of PW11 and PW4 complexes was confirmed by 31P NMR and FTIR analysis. The surface properties of all the catalysts synthesized were explored by various characterization techniques such as nitrogen sorption, TGA, contact angle measurement, and ICP-OES analysis. The synthesized PW11/MP catalysts were employed for selective oxidation of alcohols. Among the various PW11 supported catalysts, PW11/MP (80 : 20) demonstrated excellent catalytic activity for the oxidation of alcohols using aqueous H2O2. The PW11/MP (80 : 20) catalyst showed good catalytic activity for oxidation of a wide range of alcohols including substituted, heterocyclic and secondary alcohols. The superior catalytic activity of PW11/MP (80 : 20) is attributed to an optimum balance in the hydrophilicity/hydrophobicity in the mesoporous environment, better catalyst wettability, and enrichment of reactants in the catalytic active sites. Selective oxidation of alcohols using polyoxotungstate immobilized mesoporous polymer.![]()
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Affiliation(s)
- Sathyapal R Churipard
- Materials Science and Catalysis Division, Poornaprajna Institute of Scientific, Research (PPISR) Bidalur Post, Devanahalli Bangalore-562164 Karnataka State India +91 23619034 +91 80 27408552.,Graduate Studies, Manipal Academy of Higher Education Manipal - 576104 Karnataka India
| | - Kempanna S Kanakikodi
- Materials Science and Catalysis Division, Poornaprajna Institute of Scientific, Research (PPISR) Bidalur Post, Devanahalli Bangalore-562164 Karnataka State India +91 23619034 +91 80 27408552.,Graduate Studies, Manipal Academy of Higher Education Manipal - 576104 Karnataka India
| | - Jyoti Roy Choudhuri
- BMS Institute of Technology and Management Doddaballapur Main Road, Avalahalli, Yelahanka Bangalore Karnataka - 560064 India
| | - Sanjeev P Maradur
- Materials Science and Catalysis Division, Poornaprajna Institute of Scientific, Research (PPISR) Bidalur Post, Devanahalli Bangalore-562164 Karnataka State India +91 23619034 +91 80 27408552
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18
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Daughtry J, Andersson GG, Metha GF, Tesana S, Nakayama T. Sub-monolayer Au 9 cluster formation via pulsed nozzle cluster deposition. NANOSCALE ADVANCES 2020; 2:4051-4061. [PMID: 36132769 PMCID: PMC9416922 DOI: 10.1039/d0na00566e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 07/17/2020] [Indexed: 05/07/2023]
Abstract
Submonolayer coverages of chemically synthesised triphenylphosphine-protected Au9 clusters on mica and TiO2 substrates were achieved through the development of a Pulsed Nozzle Cluster Deposition (PNCD) technique under high vacuum conditions. This method offers the deposition of pre-prepared, solvated clusters directly onto substrates in a vacuum without the potential for contamination from the atmosphere. AFM and TEM were used to investigate the rate of gold cluster deposition as a function of cluster solution concentration and the number of pulses, with pulse number showing the most effective control of the final deposition conditions. TEM and XPS were used to determine that the clusters retained their unique properties through the deposition process. Methanol solvent deposited in the PNCD process has been shown to be removable through post-deposition treatments. A physical model describing the vapour behaviour and solvent evaporation in a vacuum is also developed and presented.
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Affiliation(s)
- Jesse Daughtry
- Flinders Institute for NanoScale Science and Technology, Flinders University Adelaide SA 5001 Australia
- Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University Adelaide SA 5042 Australia
| | - Gunther G Andersson
- Flinders Institute for NanoScale Science and Technology, Flinders University Adelaide SA 5001 Australia
- Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University Adelaide SA 5042 Australia
| | - Gregory F Metha
- Department of Chemistry, The University of Adelaide Adelaide SA 5005 Australia
| | - Siriluck Tesana
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences, University of Canterbury Christchurch 8041 New Zealand
| | - Tomonobu Nakayama
- National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
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19
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Howard-Fabretto L, Andersson GG. Metal Clusters on Semiconductor Surfaces and Application in Catalysis with a Focus on Au and Ru. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1904122. [PMID: 31854037 DOI: 10.1002/adma.201904122] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 09/13/2019] [Indexed: 06/10/2023]
Abstract
Metal clusters typically consist of two to a few hundred atoms and have unique properties that change with the type and number of atoms that form the cluster. Metal clusters can be generated with a precise number of atoms, and therefore have specific size, shape, and electronic structures. When metal clusters are deposited onto a substrate, their shape and electronic structure depend on the interaction with the substrate surface and thus depend on the properties of both the clusters and those of the substrate. Deposited metal clusters have discrete, individual electron energy levels that differ from the electron energy levels in the constituting individual atoms, isolated clusters, and the respective bulk material. The properties of clusters with a focus on Au and Ru, the methods to generate metal clusters, and the methods of deposition of clusters onto substrate surfaces are covered. The properties of cluster-modified surfaces are important for their application. The main application covered here is catalysis, and the methods for characterization of the cluster-modified surfaces are described.
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Affiliation(s)
- Liam Howard-Fabretto
- Flinders Institute for Nanoscale Science and Technology, Flinders University, Adelaide, SA, 5042, Australia
- Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University, Adelaide, SA, 5042, Australia
| | - Gunther G Andersson
- Flinders Institute for Nanoscale Science and Technology, Flinders University, Adelaide, SA, 5042, Australia
- Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University, Adelaide, SA, 5042, Australia
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20
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The Influence of the Gold Particle Size on the Catalytic Oxidation of 5-(Hydroxymethyl)furfural. Catalysts 2020. [DOI: 10.3390/catal10030342] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
For the production of chemicals from biomass, new selective processes are required. The selective oxidation of 5-(Hydroxymethyl)furfural (HMF), a promising platform molecule in fine chemistry, to 2,5-furandicarboxylic acid (FDCA) is considered a promising approach and requires the oxidation of two functional groups. In this study, Au/ZrO2 catalysts with different mean particle sizes were prepared by a chemical reduction method using tetrakis(hydroxymethyl)phosphonium chloride (THPC) and tested in HMF oxidation. The catalyst with the smallest mean particle size (2.1 nm) and the narrowest particle size distribution was highly active in the oxidation of the aldehyde moiety of HMF, but less active in alcohol oxidation. On the other hand, increased activity in FDCA synthesis up to 92% yield was observed over catalysts with a larger mean particle size (2.7 nm), which had a large fraction of small and some larger particles. A decreasing FDCA yield over the catalyst with the largest mean particle size (2.9 nm) indicates that the oxidation of both functional groups require different particle sizes and hint at the presence of an optimal particle size for both oxidation steps. The activity of Au particles seems to be influenced by surface steps and H bonding strength, the latter particularly in aldehyde oxidation. Therefore, the presence of both small and some larger Au particles seem to give catalysts with the highest catalytic activity.
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21
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Gold Nanoparticles for Oxidation Reactions: Critical Role of Supports and Au Particle Size. TOP ORGANOMETAL CHEM 2020. [DOI: 10.1007/3418_2020_42] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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22
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Sable V, Shah J, Sharma A, Kapdi AR. Pd-Colloids-Catalyzed/Ag 2 O-Oxidized General and Selective Esterification of Benzylic Alcohols. Chem Asian J 2019; 14:2639-2647. [PMID: 31107588 DOI: 10.1002/asia.201900566] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 05/20/2019] [Indexed: 12/29/2022]
Abstract
Palladium colloids obtained from the degradation of Hermann-Beller palladacycle proved to be an efficient catalytic system in combination with silver oxide as a selective oxidant for the oxidative esterification of differently substituted benzyl alcohols in MeOH as solvent. Excellent reactivity exhibited by the catalytic system also allowed the alcoholic coupling partner to be changed from MeOH to a wide range of alcohols having diverse functionalities. The mildness of the developed protocol also made it possible to employ propargyl alcohol as the coupling partner without any observation of any interference of the terminal alkyne. Selective oxidative coupling of a primary alcoholic functional group over secondary in the case of glycols and glycerols was also made possible using the developed catalyst system. To test the relevancy of Pd/Ag combined catalysis mixed Pd/Ag colloids were synthesized, characterized by TEM, XRD and XPS and applied to oxidative-esterification successfully.
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Affiliation(s)
- Vaibhav Sable
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Matunga, Mumbai-, 400019, India
| | - Jagrut Shah
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Matunga, Mumbai-, 400019, India
| | - Anuja Sharma
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Matunga, Mumbai-, 400019, India
| | - Anant R Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Matunga, Mumbai-, 400019, India
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23
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Golosnaya MN, Pichugina DA, Kuz’menko NE. Structure and reactivity of gold cluster protected by triphosphine ligands: DFT study. Struct Chem 2019. [DOI: 10.1007/s11224-019-01292-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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Adnan RH, Golovko VB. Benzyl Alcohol Oxidation Using Gold Catalysts Derived from Au8 Clusters on TiO2. Catal Letters 2018. [DOI: 10.1007/s10562-018-2625-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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25
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Hwang J, Siddique AB, Kim YJ, Lee H, Maeng JH, Ahn Y, Lee JS, Kim HS, Lee H. Ionic cellulose-stabilized gold nanoparticles and their application in the catalytic reduction of 4-nitrophenol. RSC Adv 2018; 8:1758-1763. [PMID: 35542619 PMCID: PMC9077261 DOI: 10.1039/c7ra11393e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 12/23/2017] [Indexed: 11/21/2022] Open
Abstract
A novel strategy for the synthesis of highly stable gold nanoparticles (GNPs) was designed by reducing HAuCl4 with NaBH4 in an aqueous solution of water-soluble ionic cellulose composed of dimethylimidazolium cations and phosphite-bound cellulose anions. NMR and UV-Vis analysis along with the measurement of the zeta potential suggest that the exceptionally high stability of GNPs originates from the strong interaction of GNPs with the phosphite groups of the ionic cellulose. The thus prepared GNPs exhibit excellent catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol, a model hydrogenation reaction. Gold nanoparticles (GNP) were highly stabilized by water soluble ionic cellulose by the strong interaction of GNP with the phosphite groups and showed extremely high catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol.![]()
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Affiliation(s)
- J. Hwang
- Department of Chemistry and Research Institute of Basic Sciences
- Kyung Hee University
- Dongdaemun-gu
- Republic of Korea
| | - A. B. Siddique
- Department of Chemistry and Research Institute of Basic Sciences
- Kyung Hee University
- Dongdaemun-gu
- Republic of Korea
| | - Y. J. Kim
- Department of Chemistry and Research Institute of Basic Sciences
- Kyung Hee University
- Dongdaemun-gu
- Republic of Korea
| | - H. Lee
- Department of Chemistry and Research Institute of Basic Sciences
- Kyung Hee University
- Dongdaemun-gu
- Republic of Korea
| | - J. H. Maeng
- Department of Chemistry and Research Institute of Basic Sciences
- Kyung Hee University
- Dongdaemun-gu
- Republic of Korea
| | - Y. Ahn
- Department of Chemistry and Research Institute of Basic Sciences
- Kyung Hee University
- Dongdaemun-gu
- Republic of Korea
| | - J. S. Lee
- Department of Chemistry and Research Institute of Basic Sciences
- Kyung Hee University
- Dongdaemun-gu
- Republic of Korea
| | - H. S. Kim
- Department of Chemistry and Research Institute of Basic Sciences
- Kyung Hee University
- Dongdaemun-gu
- Republic of Korea
| | - H. Lee
- Clean Energy Center
- Korea Institute of Science and Technology
- Sungbuk-gu
- Republic of Korea
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26
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Taketoshi A, Ishida T, Ohashi H, Honma T, Haruta M. Preparation of gold clusters on metal oxides by deposition-precipitation with microwave drying and their catalytic performance for CO and sulfide oxidation. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(17)62909-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Li R, Zhao J, Yang F, Zhang Y, Ramella D, Peng Y, Luan Y. An Fe3O4@P4VP@FeCl3 core–shell heterogeneous catalyst for aerobic oxidation of alcohols and benzylic oxidation reaction. RSC Adv 2017. [DOI: 10.1039/c7ra09005f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
A novel Fe3O4@P4VP@FeCl3 core–shell catalyst has been developed through coordination interaction between P4VP and FeCl3, which was utilized in selective oxidation of alcohols using molecular oxygen as the oxidant.
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Affiliation(s)
- Ruilian Li
- Hunan Agricultural University
- P. R. China
| | - Jian Zhao
- School of Materials Science and Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
| | - Fengxia Yang
- School of Materials Science and Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
| | - Yingchao Zhang
- School of Materials Science and Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
| | | | - Yu Peng
- Hunan Agricultural University
- P. R. China
| | - Yi Luan
- School of Materials Science and Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
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28
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Synthesis, Characterization, and Relative Study on the Catalytic Activity of Zinc Oxide Nanoparticles Doped MnCO3, –MnO2, and –Mn2O3 Nanocomposites for Aerial Oxidation of Alcohols. J CHEM-NY 2017. [DOI: 10.1155/2017/2937108] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Zinc oxide nanoparticles doped manganese carbonate catalysts [X% ZnOx–MnCO3] (where X = 0–7) were prepared via a facile and straightforward coprecipitation procedure, which upon different calcination treatments yields different manganese oxides, that is, [X% ZnOx–MnO2] and [X% ZnOx–Mn2O3]. A comparative catalytic study was conducted to evaluate the catalytic efficiency between carbonates and oxides for the selective oxidation of secondary alcohols to corresponding ketones using molecular oxygen as a green oxidizing agent without using any additives or bases. The prepared catalysts were characterized by different techniques such as SEM, EDX, XRD, TEM, TGA, BET, and FTIR spectroscopy. The 1% ZnOx–MnCO3 calcined at 300°C exhibited the best catalytic performance and possessed highest surface area, suggesting that the calcination temperature and surface area play a significant role in the alcohol oxidation. The 1% ZnOx–MnCO3 catalyst exhibited superior catalytic performance and selectivity in the aerial oxidation of 1-phenylethanol, where 100% alcohol conversion and more than 99% product selectivity were obtained in only 5 min with superior specific activity (48 mmol·g−1·h−1) and 390.6 turnover frequency (TOF). The specific activity obtained is the highest so far (to the best of our knowledge) compared to the catalysts already reported in the literatures used for the oxidation of 1-phenylethanol. It was found that ZnOx nanoparticles play an essential role in enhancing the catalytic efficiency for the selective oxidation of alcohols. The scope of the oxidation process is extended to different types of alcohols. A variety of primary, benzylic, aliphatic, allylic, and heteroaromatic alcohols were selectively oxidized into their corresponding carbonyls with 100% convertibility without overoxidation to the carboxylic acids under base-free conditions.
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29
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Wang JS, Jin FZ, Ma HC, Li XB, Liu MY, Kan JL, Chen GJ, Dong YB. Au@Cu(II)-MOF: Highly Efficient Bifunctional Heterogeneous Catalyst for Successive Oxidation-Condensation Reactions. Inorg Chem 2016; 55:6685-91. [PMID: 27322613 DOI: 10.1021/acs.inorgchem.6b00925] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new composite Au@Cu(II)-MOF catalyst has been synthesized via solution impregnation and full characterized by HRTEM, SEM-EDS, XRD, gas adsorption-desorption, XPS, and ICP analysis. It has been shown here that the Cu(II)-framework can be a useful platform to stabilize and support gold nanoparticles (Au NPs). The obtained Au@Cu(II)-MOF exhibits a bifunctional catalytic behavior and is able to promote selective aerobic benzyl alcohol oxidation-Knoevenagel condensation in a stepwise way.
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Affiliation(s)
- Jing-Si Wang
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China
| | - Fa-Zheng Jin
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China
| | - Hui-Chao Ma
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China
| | - Xiao-Bo Li
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China
| | - Ming-Yang Liu
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China
| | - Jing-Lan Kan
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China
| | - Gong-Jun Chen
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China
| | - Yu-Bin Dong
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China
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30
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Johnson GE, Laskin J. Understanding ligand effects in gold clusters using mass spectrometry. Analyst 2016; 141:3573-89. [PMID: 27221357 DOI: 10.1039/c6an00263c] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This review summarizes recent research on the influence of phosphine ligands on the size, stability, and reactivity of gold clusters synthesized in solution. Sub-nanometer clusters exhibit size- and composition-dependent properties that are unique from those of larger nanoparticles. The highly tunable properties of clusters and their high surface-to-volume ratio make them promising candidates for a variety of technological applications. However, because "each-atom-counts" toward defining cluster properties it is critically important to develop robust synthesis methods to efficiently prepare clusters of predetermined size. For decades phosphines have been known to direct the size-selected synthesis of gold clusters. Despite the preparation of numerous species it is still not understood how different functional groups at phosphine centers affect the size and properties of gold clusters. Using electrospray ionization mass spectrometry (ESI-MS) it is possible to characterize the effect of ligand substitution on the distribution of clusters formed in solution at defined reaction conditions. In addition, ligand exchange reactions on preformed clusters may be monitored using ESI-MS. Collision induced dissociation (CID) may also be employed to obtain qualitative insight into the fragmentation of mixed ligand clusters and the relative binding energies of differently substituted phosphines. Quantitative ligand binding energies and cluster stability may be determined employing surface induced dissociation (SID) in a custom-built Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR-MS). Rice-Ramsperger-Kassel-Marcus (RRKM) based modeling of the SID data allows dissociation energies and entropy values to be extracted. The charge reduction and reactivity of atomically precise gold clusters, including partially ligated species generated in the gas-phase by in source CID, on well-defined surfaces may be explored using ion soft landing (SL) in a custom-built instrument combined with in situ time of flight secondary ion mass spectrometry (TOF-SIMS). Jointly, this multipronged experimental approach allows characterization of the full spectrum of relevant phenomena including cluster synthesis, ligand exchange, thermochemistry, surface immobilization, and reactivity. The fundamental insights obtained from this work will facilitate the directed synthesis of gold clusters with predetermined size and properties for specific applications.
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Affiliation(s)
- Grant E Johnson
- Physical Sciences Division, Pacific Northwest National Laboratory, P. O. Box 999, MSIN K8-88, Richland, Washington 99352, USA.
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31
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32
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Gholinejad M, Ahmadi J, Nájera C. Silica Microparticles Supported Gold and Copper Ferrite Nanoparticles: A Magnetically Recyclable Bimetallic Catalyst for Sonogashira Reaction. ChemistrySelect 2016. [DOI: 10.1002/slct.201600049] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Mohammad Gholinejad
- Department of Chemistry; Institute for Advanced Studies in Basic Sciences (IASBS); P. O. Box 45195-1159, Gavazang Zanjan 45137-6731 Iran
| | - Jahantab Ahmadi
- Department of Chemistry; Institute for Advanced Studies in Basic Sciences (IASBS); P. O. Box 45195-1159, Gavazang Zanjan 45137-6731 Iran
| | - Carmen Nájera
- Departamento de Química Orgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA).; Universidad de Alicante; Apdo. 99 E-03080- Alicante Spain
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33
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Steven JT, Golovko VB, Johannessen B, Marshall AT. Electrochemical stability of carbon-supported gold nanoparticles in acidic electrolyte during cyclic voltammetry. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2015.11.096] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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34
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Islam MT, Padilla JE, Dominguez N, Alvarado DC, Alam MS, Cooke P, Tecklenburg MMJ, Noveron JC. Green synthesis of gold nanoparticles reduced and stabilized by squaric acid and supported on cellulose fibers for the catalytic reduction of 4-nitrophenol in water. RSC Adv 2016. [DOI: 10.1039/c6ra17480a] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Gold nanoparticles reduced and stabilized by sodium squarate in water that attach to cellulose fibers and catalyse the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with sodium borohydride.
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Affiliation(s)
| | | | - Noemi Dominguez
- Metallurgical and Materials Engineering
- University of Texas
- El Paso
- USA
| | | | - Md Shah Alam
- Department of Chemistry and Biochemistry
- Central Michigan University
- Mount Pleasant
- USA
| | - Peter Cooke
- CURRL
- New Mexico State University
- Las Cruces
- USA
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35
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Al Qahtani HS, Higuchi R, Sasaki T, Alvino JF, Metha GF, Golovko VB, Adnan R, Andersson GG, Nakayama T. Grouping and aggregation of ligand protected Au9 clusters on TiO2 nanosheets. RSC Adv 2016. [DOI: 10.1039/c6ra21419c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Au9 clusters forming groups of clusters on titania nanosheets at least partially consist of individual clusters both before and after annealing. Au9 clusters also can attach as individual clusters.
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Affiliation(s)
- Hassan S. Al Qahtani
- Flinders Centre for NanoScale Science and Technology
- Flinders University
- Adelaide
- Australia
| | - Rintaro Higuchi
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
| | - Takayoshi Sasaki
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
| | - Jason F. Alvino
- Department of Chemistry
- The University of Adelaide
- Adelaide
- Australia
| | - Gregory F. Metha
- Department of Chemistry
- The University of Adelaide
- Adelaide
- Australia
| | - Vladimir B. Golovko
- The MacDiarmid Institute for Advanced Materials and Nanotechnology
- Department of Chemistry
- University of Canterbury
- Christchurch 8140
- New Zealand
| | - Rohul Adnan
- The MacDiarmid Institute for Advanced Materials and Nanotechnology
- Department of Chemistry
- University of Canterbury
- Christchurch 8140
- New Zealand
| | - Gunther G. Andersson
- Flinders Centre for NanoScale Science and Technology
- Flinders University
- Adelaide
- Australia
| | - Tomonobu Nakayama
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
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Zhang B, Fang J, Li J, Lau JJ, Mattia D, Zhong Z, Xie J, Yan N. Soft, Oxidative Stripping of Alkyl Thiolate Ligands from Hydroxyapatite-Supported Gold Nanoclusters for Oxidation Reactions. Chem Asian J 2015; 11:532-9. [DOI: 10.1002/asia.201501074] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 11/09/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Bin Zhang
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
| | - Jun Fang
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
- State Key Laboratory of Materials-Oriented Chemical Engineering; Nanjing Tech University; No. 5 Xin Mofan Road Nanjing 210009 P. R. China
| | - Jingguo Li
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
| | - Jun Jie Lau
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
| | - Davide Mattia
- Department of Chemical Engineering; University of Bath; Claverton Down Bath BA2 7AY UK
| | - Ziyi Zhong
- Institute of Chemical and Engineering Sciences; ASTAR; 1 Pesek Road Jurong Island 627833 Singapore
| | - Jianping Xie
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
| | - Ning Yan
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
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Sahu D, Silva AR, Das P. A novel iron(iii)-based heterogeneous catalyst for aqueous oxidation of alcohols using molecular oxygen. RSC Adv 2015. [DOI: 10.1039/c5ra16734e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The first example of an iron(iii)-based heterogeneous catalyst for alcohol oxidation reactions in water employing molecular oxygen has been reported. Interestingly, the immobilized catalyst shows superior activity over its homogeneous counterpart.
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Affiliation(s)
- Debojeet Sahu
- Department of Chemistry
- Dibrugarh University
- Dibrugarh
- India
| | - Ana Rosa Silva
- CICECO-Aveiro Institute of Materials
- University of Aveiro
- Aveiro
- Portugal
| | - Pankaj Das
- Department of Chemistry
- Dibrugarh University
- Dibrugarh
- India
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