A5056445952- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- CO2 Reduction Techniques and Catalysts
- Asymmetric Hydrogenation and Catalysis
- Carbon dioxide utilization in catalysis
- Organometallic Complex Synthesis and Catalysis
- Ammonia Synthesis and Nitrogen Reduction
- Chemical Reaction Mechanisms
- biodegradable polymer synthesis and properties
- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Synthesis and Biological Evaluation
- Crystallography and molecular interactions
- Advanced Chemical Physics Studies
- Photochromic and Fluorescence Chemistry
- Spectroscopy and Quantum Chemical Studies
- Radical Photochemical Reactions
- Biochemical Analysis and Sensing Techniques
- Organic Chemistry Cycloaddition Reactions
- Free Radicals and Antioxidants
- Chemical and Physical Properties in Aqueous Solutions
- Electron and X-Ray Spectroscopy Techniques
- Catalysis and Oxidation Reactions
- Catalytic Cross-Coupling Reactions
- Synthesis and Reactions of Organic Compounds
Pepperdine University
2012-2022
HRL Laboratories (United States)
2020
University of North Carolina at Chapel Hill
2016-2019
Aqueous hydride transfer is a fundamental step in emerging alternative energy transformations such as H2 evolution and CO2 reduction. "Hydricity," the donor ability of species, key metric for understanding transition metal reactivity, but comprehensive studies aqueous hydricity are scarce. An extensive self-consistent scale constructed family Ru Ir hydrides that intermediates catalysis. A reference determined using redox potentiometry spectrophotometric titration particularly water-soluble...
A series of rhenium diimine carbonyl complexes was prepared and characterized in order to examine the influence axial ligands on electronic structure. Systematic substitution acetonitrile [Re(deeb)(CO)3(NCCH3)]+ (deeb = 4,4′-diethylester-2,2′-bipyridine) with trimethylphosphine chloride, respectively, gives rise red-shifted absorbance features. These bathochromic shifts result from destabilization occupied d-orbitals involved metal-to-ligand charge-transfer transitions. Time-Dependent...
The light-driven synthesis of fuels requires efficient coupling photon absorption with bond-forming chemical reactions. Molecular photoelectrocatalysis is an emerging approach in solar fuel production based on single molecules that support electrochemical hydride formation and photochemical synthesis. This Perspective outlines the design requirements for transition metal candidates describes development first molecular photoelectrocatalyst dihydrogen (H2) evolution. Mechanistic aspects are...
Insights into the influence of solvent on hydride transfer emerge from a study iridium complexes with formula [Cp*Ir(bpy-X)H]+ (bpy-X = 4,4′-X2-2,2′-bipyridine, X H, Me, tBu, OMe, CO2Me, and CF3). Hydricity (or donor ability) is found to be equally sensitive bipyridine ligand electronic structure in both CH3CN H2O. In contrast, more strongly influenced by subsequent chloride ion binding metal center than With thermochemical parameters for six available H2O, general approach comparing...
ABSTRACT Seven magnesium complexes ( 1–7 ) were synthesized by reaction of new L 3 ‐H – 5 and previously reported ketoimine pro‐ligands with dibutyl isolated in 59–70% yields. Complexes characterized fully consisted bis ‐ligated homoleptic ketoiminates coordinated distorted octahedral geometry around the centers. The investigated for their ability to initiate ring opening polymerization (ROP) l ‐lactide (L‐LA) poly‐lactic acid (PLA) ɛ‐caprolactone (ɛCL) poly‐caprolactone presence...
The hydricity of the heterobimetallic iridium/ruthenium catalyst [Cp*Ir(H)(μ-bpm)Ru(bpy)2]3+ (1, where Cp* = η5-pentamethylcyclopentadienyl, bpm 2,2'-bipyrimidine, and bpy 2,2'-bipyridine) has been determined in both acetonitrile (63.1 kcal mol-1) water (29.7 mol-1). Hydride 1 features a large increase hydride donor ability when solvent is changed from to water. acidity 1, contrast, essentially solvent-independent because remains strongly acidic solvents. On basis an X-ray crystallographic...
Hydricity, or hydride donating ability, is a thermodynamic value that helps define the reactivity of transition metal hydrides. To avoid some challenges experimental hydricity measurements in water, computational method for determination aqueous values has been developed. With thermochemical cycle involving deprotonation (pKa), 2e– oxidation (E°), and reduction proton, are provided along with other valuable information. The impact empirical corrections (for example, calibrating potentials...
Organometallic catalysts with strong metal-to-ligand charge-transfer (MLCT) optical transitions and reactive metal–hydride bonds provide opportunities for new excited-state reactivity. Toward this end, we have investigated photoinduced transfer hydrogenation reactions a series of Cp*IrH complexes functionalized bipyridyl ligands. Overcoming the baseline reactivity class catalyst toward hydrogen evolution in aqueous media presents major challenge focusing photochemical into desired...
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionCorrection to "Thermodynamic Hydricity across Solvents: Subtle Electronic Effects and Striking Ligation in Iridium Hydrides"Kelsey R. BreretonKelsey BreretonMore by Kelsey Brereton, Caleb N. JadrichCaleb JadrichMore Jadrichhttp://orcid.org/0000-0002-7528-332X, Bethany M. StratakesBethany StratakesMore Stratakes, Alexander J. Miller*Alexander MillerMore...