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Mixed Metal Clusters
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Book Synopsis Mixed-metal Clusters by : S. N. A. B. Syed-Mustaffa
Download or read book Mixed-metal Clusters written by S. N. A. B. Syed-Mustaffa and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mixed-Metal Clusters by : Wayne L. Gladfelter
Download or read book Mixed-Metal Clusters written by Wayne L. Gladfelter and published by . This book was released on 1979 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This article is a comprehensive review of the synthesis, properties, reactivity and dynamics of mixed-metal clusters. (Author).
Book Synopsis New Group Six-group Eight Mixed-metal Clusters by : Daniel Sylvester Foose
Download or read book New Group Six-group Eight Mixed-metal Clusters written by Daniel Sylvester Foose and published by . This book was released on 1981 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Chemistry of Mixed-Metal Clusters of Osmium and Palladium by : 許穎思
Download or read book The Chemistry of Mixed-Metal Clusters of Osmium and Palladium written by 許穎思 and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Tetrahedral Mixed-Metal Clusters of the Iron Triad. Preparation and Characterization of H2FeRu2Os(CO)13 and H2FeRuOs2(CO)13 by : Gregory L. Geoffroy
Download or read book Synthesis of Tetrahedral Mixed-Metal Clusters of the Iron Triad. Preparation and Characterization of H2FeRu2Os(CO)13 and H2FeRuOs2(CO)13 written by Gregory L. Geoffroy and published by . This book was released on 1977 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition metal cluster complexes have become a very important class of compounds, principally because of their potential in catalysis. Clusters have been shown to behave as catalysts in their own right and they hold considerable promise for serving as models for catalytic surfaces. Clusters comprised of two or more different transition metals in the cluster framework are particularly interesting in this regard because of possible bimetallic effects. Further, mixed-metal clusters have non-equivalent bonding sites. As such they are ideally suited for modeling studies which employ variable temperature NMR to follow the movements of substrates over their surfaces. One of the problems which has hampered studies of mixed-metal clusters is their relative lack of availability. Only a very few isostructural series have been achieved, and general synthetic methods for mixed-metal clusters are lacking. Carbonylmetalates have been widely used as synthetic reagents in cluster chemistry and several of the reported reactions appear to be adaptable to design. This is particularly true of the reactions of Knight and Mays who prepared a series of Group 7 - Group 8 tetrameric mixed-metal clusters through the addition of a carbonylmetalate to a closed M3(CO)12 trimer.
Book Synopsis A Synthetic Approach to Mixed Metal Clusters by : Maram Mary Kassis
Download or read book A Synthetic Approach to Mixed Metal Clusters written by Maram Mary Kassis and published by . This book was released on 1986 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Chemistry of Mixed-Metal Clusters of Osmium and Rhodium by : Po-Kwan Jasmine Lau
Download or read book The Chemistry of Mixed-Metal Clusters of Osmium and Rhodium written by Po-Kwan Jasmine Lau and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "The Chemistry of Mixed-metal Clusters of Osmium and Rhodium" by Po-kwan, Jasmine, Lau, 劉寶君, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled THE CHEMISTRY OF MIXED-METAL CLUSTERS OF OSMIUM AND RHODIUM Submitted by LAU PO KWAN JASMINE for the degree of Doctor of Philosophy at The University of Hong Kong in December 2005 The general background of metal clusters, the chemistry of osmium-rhodium mixed-metal clusters, and their potential catalytic applications are reviewed. The work in the synthesis, characterizations, and reactivity studies of different series of osmium-rhodium mixed-metal clusters help us to understand the properties and reactivities of new clusters as compared to the bulk metal surface. 1 1 1 A novel face-capping mode of toluene was observed in [Os Rh (μ -η η η - 3 4 3 C H CH )(CO) ] 1. Cluster 1, together with [Os Rh(-H)(η -C H CH )(CO) ] 2 6 5 3 13 4 6 5 3 12 and a known compound [Os Rh (η -C H CH )(-CO)(CO) ], were obtained from 5 2 6 5 3 16 the reaction of [Os Rh(μ-H) (CO) ] with toluene in the presence of an excess 3 3 12amount of 4-vinylphenol. The reaction of [Os Rh(-H) (CO) ] with an excess 3 3 12 amount of 4-vinylphenol (as a hydride acceptor) in refluxing m-xylene, chlorobenzene, or benzene yielded three new clusters [Os Rh {η -C H (CH ) } 5 2 6 4 3 2 6 6 (-CO)(CO) ] 3, [Os Rh (η -C H Cl)(-CO)(CO) ] 4, and [Os Rh (η -C H ) 16 5 2 6 5 16 5 2 6 6 (-CO)(CO) ] 5, respectively. 16 The hydrogenation of [Os Rh (η -C H CH )(-CO)(CO)] with 5 2 6 5 3 16 [Os (-H) (CO) ] resulted in moderate yields of two hydrogen-rich compounds: 3 2 10 [Os Rh (-H) (CO) ] 6 and [Os Rh Cl(-H) (CO) ] 7. The reaction of 7 3 11 23 5 3 8 18 [Os Rh (η -C H CH )(-CO)(CO) ] with hydrogen yielded a new cluster 5 2 6 5 3 16 compound, [Os Rh(-H) (CO) ] 8. A deuterium exchange experiment was 5 5 18 performed on 6, and 7. Both the compounds proved to be able to exchange the H atom with D in the presence of D SO, and the absence of the hydride signal in the 2 4 H NMR spectrum is consistent with this. Therefore, clusters 6 and 7 may serve as appropriate new hydrogen storage models. A detailed discussion of the chemistry of anionic osmium-rhodium mixed-metal clusters with Au cationic fragments using [Au(PPh )Cl] and [(AuCl) L-L], where L 3 2 = dppe (bis(diphenylphosphino)ethane) or dppp (bis(diphenylphosphino)propane), is presented. Two mono-anionic osmium-rhodium mixed-metal clusters [PPN][Os Rh(μ-CO)(CO) ] 9 and [PPN][Os Rh (μ-CO) (CO) ] 10 were prepared 6 19 9 3 2 26 by the thermolysis of [Os Rh(μ-H) (CO) ]. Electrochemistry studies on 10 showed 3 3 12 four successive redox couples, and revealed a novel electron reservoir property. Treatment of 9 with two equivalent of [Au(PPh)Cl] gave compounds [Os Rh Au(CO) (PPh )] 11, and [Os Au (CO) (PPh ) ][Os Rh(μ-CO)(CO) ] 12. 4 3 18 3 5 3 15 3 3 6 19 Both compounds successfully demonstrated the introduction of the Au(PR ) units 3into transition-metal clusters. Two linked clusters [{Os RhAu(μ-CO)(CO) } (dppp)] 6 19 2 13 and [{Os RhAu(μ-CO)(CO) } (dppe)] 14 were prepared by the reaction of 9 6 19 2 with two equivalent [(AuCl) dppp] and [(AuCl) dppe], respectively. 2 2 The synthesis and characterization of linked cluster [{Os (CO) (μ -H)} 3 10 2 2 {μ,μ -NC H C H N}] 15 from the reaction of [Os Rh(μ-H) (CO) ] with aniline in 2 2 6 4 6 4 3 3 12 the presence of an excess amount of 4-vinyl phenol
Book Synopsis Synthetic and Structural Aspects of Mixed-metal Clusters Containing the Group IB Metals by : I. D. Salter
Download or read book Synthetic and Structural Aspects of Mixed-metal Clusters Containing the Group IB Metals written by I. D. Salter and published by . This book was released on 1983 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Rational Synthesis of Mixed-metal Clusters by Photogenerated Metal-fragment Addition to the Coordinatively Unsaturated Co2(eta5-C5Me5)2(mu2-CO)2 Neutral Dimer by : Larry Michael Cirjak
Download or read book The Rational Synthesis of Mixed-metal Clusters by Photogenerated Metal-fragment Addition to the Coordinatively Unsaturated Co2(eta5-C5Me5)2(mu2-CO)2 Neutral Dimer written by Larry Michael Cirjak and published by . This book was released on 1980 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Chemistry of Mixed-metal Clusters of Osmium and Rhodium by : Po-kwan Lau (Jasmine)
Download or read book The Chemistry of Mixed-metal Clusters of Osmium and Rhodium written by Po-kwan Lau (Jasmine) and published by . This book was released on 2005 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of the Synthesis of Mixed-metal Clusters of Molybdenum and Iron by : David B. Beach
Download or read book An Investigation of the Synthesis of Mixed-metal Clusters of Molybdenum and Iron written by David B. Beach and published by . This book was released on 1981 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Medium-nuclearity Mixed-metal Cluster Chemistry by : Junhong Fu
Download or read book Medium-nuclearity Mixed-metal Cluster Chemistry written by Junhong Fu and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis is comprised of nine scientific articles and is preceded by an overview that contextualises all of publications. Mixed-metal clusters of group 6 and 9 have been of longstanding interest. The polar metal-metal bonds in these clusters exhibit great potential for substrate activation, and the widely disparate metals could increase cluster reactivity. Our previous studies of group 6 and 9 mixed-metal clusters have been mainly concentrated on low-nuclearity tetranuclear molybdenum/tungsten-iridium clusters, including the study of their structure, fluxionality, reactivity, electrochemistry, spectroelectrochemistry and optical properties. The thesis project herein mainly focuses on the synthesis of medium-nuclearity clusters of group 6 and 9. The first part of this body of work is concerned with the synthesis of medium-nuclearity molybdenum/tungsten-iridium clusters. Publication 1 details the synthesis of pentanuclear clusters by core expansion of tetranuclear molybdenum/tungsten-iridium clusters with capping reagents tetramethylcyclopentadienyl iridium dicarbonyl and pentamethylcyclopentadienyl iridium dicarbonyl. Publication 2 describes phosphine, isocyanide, and alkyne reactivity at several pentanuclear molybdenum/tungsten-iridium clusters that are reported in Publication 1. Three structurally characterized medium-nuclearity molybdenum-iridium clusters are presented in Publication 3.The second part of the thesis includes the synthesis of medium-nuclearity molybdenum/tungsten-rhodium-iridium clusters by core expansion reactions of tetranuclear molybdenum/tungsten-iridium clusters with capping reagents tetramethylcyclopentadienyl rhodium dicarbonyl and pentamethylcyclopentadienyl rhodium dicarbonyl. Publication 4 delineates a dynamic permutational isomerism in a pentanuclear ditungsten-rhodium-diiridium closo-cluster, together with the proposed mechanism and studies of the chemical and physical properties of the permutational isomers. Publication 5 and 6 detail the syntheses of penta- and hexa-nuclear molybdenum/tungsten-rhodium-iridium clusters by core expansion of tetranuclear molybdenum/tungsten-iridium clusters with the rhodium capping reagents, and phosphine and alkyne chemistry of the pentanuclear clusters. Publication 7 demonstrates the synthesis and structural studies of a hexanuclear trimolybdenum-triiridium cluster and a heptanuclear trimolybdenum-rhodium-triiridium cluster. In addition, Publication 8 describes alkyne chemistry at a phosphine-substituted cluster and explores the impact of phosphine ligation to dimolybdenum-diiridium on optical limiting properties. Finally, Publication 9 reports a four-valence-electron-deficient butterfly tetrairidium cluster and a heptairidium cluster, together with theoretical studies of the tetrairidium cluster.
Book Synopsis The Rational Synthesis of Mixed-metal Clusters by Photogenerated Metal-fragment Addition to the Coordinatively Unsaturated Co2(eta5-C5Me5)2(mu2-CO)2 Neutral Dimer by : Larry Michael Cirjak
Download or read book The Rational Synthesis of Mixed-metal Clusters by Photogenerated Metal-fragment Addition to the Coordinatively Unsaturated Co2(eta5-C5Me5)2(mu2-CO)2 Neutral Dimer written by Larry Michael Cirjak and published by . This book was released on 1980 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mixed Metal Clusters by : Michael John Liddell
Download or read book Mixed Metal Clusters written by Michael John Liddell and published by . This book was released on 1985 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mixed-metal Clusters as Precursors for Bimetallic Supported Nanoparticle Catalysts by : S. Hermans
Download or read book Mixed-metal Clusters as Precursors for Bimetallic Supported Nanoparticle Catalysts written by S. Hermans and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optical Properties of Metal Clusters by : Uwe Kreibig
Download or read book Optical Properties of Metal Clusters written by Uwe Kreibig and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical Properties of Metal Clusters deals with the electronic structure of metal clusters determined optically. Clusters - as state intermediate between molecules and the extended solid - are important in many areas, e.g. in air pollution, interstellar matter, clay minerals, photography, heterogeneous catalysis, quantum dots, and virus crystals. This book extends the approaches of optical molecular and solid-state methods to clusters, revealing how their optical properties evolve as a function of size. Cluster matter, i.e. extended systems of many clusters - the most frequently occuring form - is also treated. The combination of reviews of experimental techniques, lists of results and detailed descriptions of selected experiments will appeal to experts, newcomers and graduate students in this expanding field.
Book Synopsis The Chemistry of Mixed-metal Clusters of Osmium and Palladium by : Wing-sze Hui (Janesse)
Download or read book The Chemistry of Mixed-metal Clusters of Osmium and Palladium written by Wing-sze Hui (Janesse) and published by . This book was released on 1998 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: