A5009471972- Polyoxometalates: Synthesis and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Porphyrin Metabolism and Disorders
- Folate and B Vitamins Research
- Nanocluster Synthesis and Applications
- Nanomaterials for catalytic reactions
- Asymmetric Hydrogenation and Catalysis
- Organometallic Complex Synthesis and Catalysis
- Catalytic Processes in Materials Science
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Nanomaterials in Catalysis
- nanoparticles nucleation surface interactions
- Chemical Synthesis and Reactions
- Oxidative Organic Chemistry Reactions
- Vanadium and Halogenation Chemistry
- Electrocatalysts for Energy Conversion
- Crystallization and Solubility Studies
- Heme Oxygenase-1 and Carbon Monoxide
- Porphyrin and Phthalocyanine Chemistry
- X-ray Diffraction in Crystallography
- Chemical Synthesis and Characterization
- Inorganic and Organometallic Chemistry
- Biochemical and Molecular Research
- Metal-Catalyzed Oxygenation Mechanisms
- Surface Chemistry and Catalysis
Colorado State University
2016-2025
Washington University in St. Louis
2012
Yeshiva University
2010
University of Colorado Boulder
2009
Middle East Technical University
2002-2009
University of California, Berkeley
2008
Brandeis University
2008
Queen's University Belfast
2005-2007
University of Neuchâtel
2005
École Polytechnique Fédérale de Lausanne
2005
Following an overview of the primitive state mechanistic studies formation nanoclusters, with a focus on LaMer's classic work sulfur sols, kinetic and our recently reported novel P2W15Nb3O629- polyoxoanion- Bu4N+- stabilized Ir∼190-450 (hereafter, Ir(0)∼300) nanoclusters are presented. The consists full experimental other details following eight major components: (i) development indirectbut easy, continuous, highly quantitative thus powerfulmethod to monitor Ir(0) via their catalytic...
The question of "what is the true catalyst?" when beginning with cobalt polyoxometalate (POM) [Co4(H2O)2(PW9O34)2]10– in electrochemical water oxidation catalysis examined pH 8.0 sodium phosphate buffer at a glassy carbon electrode. Is catalyst (WOC), or just precatalyst? Electrochemical, kinetic, UV–vis, SEM, EDX, and other data provide four main lines compelling evidence that, under conditions used herein, dominant WOC actually heterogeneous CoOx not homogeneous [Co4(H2O)2(PW9O34)2]10–.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrivacant heteropolytungstate derivatives. 3. Rational syntheses, characterization, two-dimensional tungsten-183 NMR, and properties of tungstometallophosphates P2W18M4(H2O)2O6810- P4W30M4(H2O)2O11216- (M = cobalt, copper, zinc)Richard G. Finke, Michael W. Droege, Peter J. DomailleCite this: Inorg. Chem. 1987, 26, 23, 3886–3896Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inissue 1 November...
Polyoxometalates (POMs) have been proposed to be excellent homogeneous water oxidation catalysts (WOCs) due their oxidative stability and activity. However, recent literature indicates that even these relatively robust compounds can transformed into heterogeneous, metal-oxide WOCs under the oxidizing reaction conditions needed drive O2 evolution. This review covers experimental methodology for distinguishing heterogeneous WOCs; it then addresses "what is true catalyst?" problem POMs used as...
A look back at LaMer's 1950 model of particle formation is undertaken (LaMer, V. K.; Dinegar, R. H. Theory, Production and Mechanism Formation Monodispersed Hydrosols. J. Am. Chem. Soc. 1950, 72, 4847–4854), a highly cited paper that has more than 1953 citations as March 2019. The nonmathematical, verbal version model, namely, the concepts "instantaneous" (or "burst") nucleation "diffusion-controlled" growth, continues to be heavily because, until recently, it was only known way try explain...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly oxidation resistant inorganic-porphyrin analog polyoxometalate catalysts. 1. The synthesis and characterization of aqueous-soluble potassium salts .alpha.2-P2W17O61(Mn+.cntdot.OH2)(n-10) organic solvent soluble tetra-n-butylammonium .alpha.2-P2W17O61(Mn+.cntdot.Br)(n-11) (M = Mn3+,Fe3+,Co2+,Ni2+,Cu2+)David K. Lyon, Warren Miller, Thomas Novet, Peter J. Domaille, Eric Evitt, David C. Johnson, Richard G. FinkeCite this: Am. Chem. Soc. 1991,...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA More General Approach to Distinguishing "Homogeneous" from "Heterogeneous" Catalysis: Discovery of Polyoxoanion- and Bu4N+-Stabilized, Isolable Redissolvable, High-Reactivity Ir.apprx.190-450 Nanocluster CatalystsYin Lin Richard G. FinkeCite this: Inorg. Chem. 1994, 33, 22, 4891–4910Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October...
To start, a brief introduction is provided on the importance of transition-metal nanoclusters, need to develop and then apply methods rank nanocluster formation stabilizing abilities commonly employed anions, solvents, cations, polymers, somewhat confused literature stabilization. The fundamental surface-adsorbed anions in stabilization noted, reason present studies begin with study nanocluster-stabilizing anions. Next, five criteria, as well associated experimental methods, are developed...
The mystery of how 1,3-substituted imidazolium-based ionic liquids (ILs) can provide high stabilization for transition-metal(0) nanoclusters, that is, in the absence usual strongly coordinating anions, has been probed. 2H NMR product and kinetic studies imidazolium ILs under D2 reveal nanocluster-catalyzed H/D exchange occurs at 2- (as well as 4-, 5-, 8-) C-H positions cation. results (i) compelling evidence N-heterocyclic carbene formation ligation nanoclusters is occurring ILs; (ii) argue...
A reinvestigation of the true catalyst in a benzene hydrogenation system beginning with Ru(II)(eta(6)-C(6)Me(6))(OAc)(2) as precatalyst is reported. The key observations leading to conclusion that bulk ruthenium metal particles, and not homogeneous complex or soluble nanocluster, are follows: (i) catalytic reaction follows nucleation (A --> B) then autocatalytic surface-growth + B 2B) sigmoidal kinetics mechanism recently elucidated for metal(0) formation from precatalysts; (ii) forms during...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrisubstituted heteropolytungstates as soluble metal oxide analogs. III. Synthesis, characterization, phosphorus-31, silicon-29, vanadium-51, and 1- 2-D tungsten-183 NMR, deprotonation, proton mobility studies of organic solvent solute forms HxSiW9V3O40x-7 HxP2W15V3O62x-9Richard G. Finke, Brian. Rapko, Robert J. Saxton, Peter DomailleCite this: Am. Chem. Soc. 1986, 108, 11, 2947–2960Publication Date (Print):May 1, 1986Publication History Published...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermolysis of the cobalt-carbon bond adenosylcobalamin. 2. Products, kinetics, and dissociation energy in aqueous solutionBenjamin P. Hay Richard G. FinkeCite this: J. Am. Chem. Soc. 1986, 108, 16, 4820–4829Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 August 1986https://doi.org/10.1021/ja00276a020Request reuse permissionsArticle Views461Altmetric-Citations206LEARN ABOUT THESE...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Polyoxoanion- and Bu4N+-Stabilized, Isolable, Redissolvable, 20-30-.ANG. Ir300-900 Nanoclusters: The Kinetically Controlled Synthesis, Characterization, Mechanism of Formation Organic Solvent-Soluble, Reproducible Size, Catalytic Activity Metal NanoclustersYin Lin Richard G. FinkeCite this: J. Am. Chem. Soc. 1994, 116, 18, 8335–8353Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1...
Our recent kinetic and mechanistic studies of the formation Bu4N+ P2W15Nb3O629- polyoxoanion-stabilized Ir(0)∼300 nanoclusters led to elucidation a new mechanism for synthesized from metal salts under H2: slow, continuous nucleation, rate constant k1, then autocatalytic surface growth, k2. This contains four key, previously unverified predictions: (i) that are "living-metal polymers" and, hence, series increasing size can be by design; (ii) ratio rates growth R (=k2[nanocluster active...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermolysis of the cobalt-carbon bond in adenosylcorrins. 3. Quantification axial base effect adenosylcobalamin by synthesis and thermolysis base-free adenosylcobinamide. Insights into energetics enzyme-assisted homolysisBenjamin P. Hay Richard G. FinkeCite this: J. Am. Chem. Soc. 1987, 109, 26, 8012–8018Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Published inissue 1 December...
The four-step mechanism by which transition-metal nanoclusters or bulk-metal films self-assemble from metal salts under reductive conditions has been discovered. presence of two autocatalytic steps in the same reaction scheme--double autocatalysis--is key to sharp "turn-on" feature after an induction period observed signature kinetic curves. Predictions new that are tested experimentally include following: low concentrations and high temperatures will favor over film formation; is formed...
A reinvestigation is reported of a prototype literature arene hydrogenation system, one previously believed to involve [(C8H17)3NCH3]+[RhCl4]- ion-pair catalyst. The methodology employed uncover the true catalyst, and deal with classic difficult mechanistic problem "is it homogeneous or heterogeneous catalysis?", four-step approach developed in our laboratories. data obtained (i) provide unequivocal TEM evidence that Rh(0) nanoclusters are formed under reaction conditions (ii) kinetic...