Office: Chemistry C127A
Phone: (970) 491-6292
Google Scholar: https://scholar.google.com/citations?hl=en&user=J6DZJuIAAAAJ
- Ph.D., California Institute of Technology
Research interests are focused on the theoretical study of catalytic processes. Reactions currently under study include single-site propylene polymerization and hydrocarbon oxygenation. Modern Heterogenous catalysts function at the nanoscale with metal particles in the 10 nm range and metal sulfides with 3-5 nm wafer size. A particularly important question in catalysis is at what size do desirable bulk properties develop? When does a molecule become a solid? For properties such as ionization potential the bulk value is attained rather soon. The electron affinity and associated work function (IP-EA)/2 evolve more slowly, likely requiring hundreds of atoms. A catalytically important property that we are focussed on is the size-development of the solid-vacuum dielectric discontinuity which is present in a solid but absent in a molecular scale cluster. The associated electric field gradient likely plays an important role in stabilizing ionic species such as carbocations on catalyst particle surfaces. Since catalytic processes involve the reaction of relatively large chemical reagents in the condensed state, we, by necessity, are in the business of developing theoretical methodologies as well as validating and applying present-day techniques to catalytic reactions. This effort includes the development of molecular mechanics and dynamics technologies including the development of full periodic table molecular mechanics force fields, the development of functional forms and models consistent with the making and breaking of chemical bonds, and the development and documentation of molecular dynamics procedures for studying reactive species under controlled-temperature and high-pressure conditions. Since molecular mechanics and dynamics procedures, by their empirical nature, provide little insight into the electronic structure of metal ligand bonds and the electronic structural reorganization that accompanies a chemical reaction, we also utilize ab initio electronic structure tools. The types of electronic structure methods utilized generally attempt to include electron correlation (many-body) effects well enough to obtain reasonably accurate descriptions of the ground states of molecules both near equilibrium geometries and as they react. Additionally, correlation is included in a manner so as to permit interpretation and generalization of the electronic structural results into viable chemical concepts. These electronic structure techniques are used to probe the electronic control of catalytic processes through ligand tuning and to understand the character of metal ligand (primarily oxygen) bonding. Important questions here are 1) why do particular metal oxides epoxide olefins, others cis-dihdyroxylate olefins, and still others allylically oxidize olefins? 2) Can over oxygenation (combustion) be shut down by turning off radical autoxidation?
- Isotopomeric Elucidation of the Mechanism of Temperature Sensitivity in 59Co NMR Molecular Thermometers Inorganic Chemistry, 2022.
- Sterics, the core of intermolecular interactionsIntra- and Intermolecular Interactions Between Non-covalently Bonded Species Elsevier, 2021.
- EXAFS Investigations of Temperature-Dependent Structure in Cobalt-59 Molecular NMR Thermometers Dalton Transactions.
- Ligand Control of 59Co Nuclear-Spin Relaxation Thermometry Magnetochemistry, 58.
- Long-Lived Mixed (MLCT)-M-2/MC States in Antiferromagnetically Coupled d(3) Vanadium(II) Bipyridine and Phenanthroline Complexes INORGANIC CHEMISTRY, 20, 2020.
- Protobranching as repulsion-induced attraction: a prototype for geminal stabilization PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 29, 2020.
- Anionic guest-dependent slow magnetic relaxation in Co(II) tripodal iminopyridine complexes DALTON TRANSACTIONS, 25, 2019.
- Evidence for Reagent-Induced Spin-State Switching in Tripodal Fe(II) Iminopyridine Complexes INORGANIC CHEMISTRY, 12, 2019.
- X-TINKER: A general strategy for incorporating a halogen bonding force field into molecular simulations, Journal of Chemical Theory and Computation.
- Hydrogen bond enhanced halogen bonds: A synergistic interaction in chemistry and biochemistry Accounts of Chemical Research, 10, 2019.
- Detection of an Energy-Transfer Pathway in Cr-Photoredox Catalysis ACS Catalysis, 10, 2018.
- Slow magnetic relaxation in octahedral low-spin Ni(III) complexes Chemical Science, 31, 2018.
- The Mechanism of C-H Bond Oxidation by Aqueous Permanganate ENVIRONMENTAL SCIENCE & TECHNOLOGY, 17, 2018.
- A family of related Co(II) terpyridine compounds exhibiting field induced single-molecule magnet properties Polyhedron, 2018.
- Slow magnetic relaxation in octahedral low-spin Ni(III) complexes Chem. Sci..
- Toward Steric Control of Guest Binding Modality: a Cationic Co(II) Complex Exhibiting Cation Binding and Zero-Field Relaxation Chem. Commun., 2017.
- Molecules of Life and a Chemistry Bootcamp Terry M. Gray Publications, 2016.
- Slow magnetic relaxation in octahedral low-spin Ni(III) complexes Chemical Science.
- Molecules of Life with a Chemistry Bootcamp Apple/Amazon, 2016.
- Uncovering the Roles of Oxygen in Cr(III) Photoredox Catalysis JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 16, 2016.
- Energy: What the world needs now Apple/Amazon, 2016.
- Highly Strained Iron(II) Polypyridines: Exploiting the Quintet ManifoldTo Extend the Lifetime of MLCT Excited States JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 9, 2016.
- Energy: What the World Needs Now Terry M. Gray Publications, 2013.
- Syntheses and photophysical investigations of Cr(III) hexadentate iminopyridine complexes and their tris(bidentate) analogues Inorganic chemistry, 3, 2013.
- Structural and electronic comparison of 1st row transition metal complexes of a tripodal iminopyridine ligand Inorganic chemistry, 22, 2012.
- Topological and electronic influences on magnetic exchange coupling in Fe(III) ethynylbenzene dendritic building blocks Journal of the American Chemical Society, 51, 2011.
- Unusual electronic effects imparted by bridging dinitrogen: an experimental and theoretical investigation Inorganic chemistry, 20, 2010.
- Intramolecular charge transfer in a trinuclear iron ene-triyne complex Chemical communications (Cambridge, England), 26, 2010.
- Experimental evidence for magnetic exchange in di- and trinuclear uranium(IV) ethynylbenzene complexes Inorganic chemistry, 4, 2010.