Modeling Transition Metal Chemistry for Catalytic Functionalization of Molecules

Modeling Transition Metal Chemistry for Catalytic Functionalization of Molecules

Date: August 2011
Creator: Morello, Glenn
Description: The diversity of transition metal complexes allows for a wide range of chemical processes to be mediated by the metal, from catalysis to surface chemistry. Investigations into the structure and electronic configuration of transition metal complexes allow for tuning of desired species by modifications to the ligands and/or metals to achieve more efficient thermodynamics and kinetics for the process of interest. Transition metals, often used in catalysts for a number of important processes, require detailed descriptions of intermediates, transition states and products to fully characterize a reaction mechanism(s) in order to design more active and efficient catalysts. Computational investigations into inorganic catalysts are explored with the aim of understanding the activity of each species and how modifications of supporting ligands, co-ligands and metals vary the interaction along the reaction pathway. Reported results give important insight into the development of the most active complexes in addition to determining the least active complexes to aid experimental development. This report first investigates the mechanisms of two unique transfer reactions: 1) formation of low coordinate nickel-nitrene ((P~P)Ni=NR; P~P = 1,2-bis(dihydrophosphino)-ethane or 1,2-bis(difluoromethylphosphino)-ethane) complexes as catalysts for nitrogen atom transfer and 2) oxidation of a triphosphorus niobium complex, [(η2-P3SnPh3)Nb(OMe)3], for the transfer of the phosphorus ...
Contributing Partner: UNT Libraries
Performance of Density Functional Theory for 3d Transition Metal-Containing Complexes: Utilization of the Correlation Consistent Basis Sets

Performance of Density Functional Theory for 3d Transition Metal-Containing Complexes: Utilization of the Correlation Consistent Basis Sets

Date: July 2, 2009
Creator: Tekarli, Sammer M.; Drummond, Michael L.; Williams, T. Gavin; Cundari, Thomas R., 1964- & Wilson, Angela K.
Description: This article discusses the performance of density functional theory for 3d transition metal-containing complexes. The performance of 44 density functionals used in conjunction with the correlation consistent basis sets (ccpVnZ where n = T and Q) has been assessed for the gas-phase enthalpies of formation at 298.15 K of 3d transition metal (TM) containing systems.
Contributing Partner: UNT College of Arts and Sciences
An Effective Core Potential Study of Transition-Metal Chalcogenides. 1. Molecular Structure

An Effective Core Potential Study of Transition-Metal Chalcogenides. 1. Molecular Structure

Date: May 1994
Creator: Benson, Michael T.; Cundari, Thomas R., 1964-; Lim, Soon J.; Nguyen, Hoang D. & Pierce-Beaver, Karen
Description: This article discusses an effective core potential study of transition-metal chalcogenides O, S, Se, and Te.
Contributing Partner: UNT College of Arts and Sciences
Effects of covalency on the p-shell photoemission of transition metals: MnO

Effects of covalency on the p-shell photoemission of transition metals: MnO

Date: April 13, 2006
Creator: Bagus, Paul S. & Ilton, Eugene S.
Description: This article discusses the effects of covalency on the p-shell photoemission of transition metals. The treatment of covalency has not been included previously in ab initio theoretical studies of the 2p-shell XPS of transition-metal complexes. In this work, covalent interactions between the metal and ligands are treated on an equal footing with spin-orbit splittings.
Contributing Partner: UNT College of Arts and Sciences
High-Valent Transition-Metal Alkylidene Complexes: Effect of Ligand and Substituent Modification

High-Valent Transition-Metal Alkylidene Complexes: Effect of Ligand and Substituent Modification

Date: 1992
Creator: Cundari, Thomas R., 1964- & Gordon, Mark S.
Description: This article discusses the effects of ligand and substituent modification on the metal-carbon double bond. The main conclusion drawn from this work is that the intrinsic nature of the metal-carbon double bond can typically be changed only within certain limits by modification of the electronegativity of the ligands (L) and substituents (Z).
Contributing Partner: UNT College of Arts and Sciences
Molybdenum and Tungsten Structural Differences are Dependent on ndz2/(n + 1)ѕ Mixing: Comparisons of (silox)3MX/R (M = Mo, W; silox = tBu3SiO)

Molybdenum and Tungsten Structural Differences are Dependent on ndz2/(n + 1)ѕ Mixing: Comparisons of (silox)3MX/R (M = Mo, W; silox = tBu3SiO)

Date: July 15, 2008
Creator: Kuiper, David S.; Douthwalte, Richard E.; Mayoi, Ana-Rita; Wolczanski, Peter T.; Lobkovsky, Emil B.; Cundari, Thomas R., 1964- et al.
Description: This article discusses molydbenum and tungsten structural differences.
Contributing Partner: UNT College of Arts and Sciences
Selective Extraction of N₂ from Air by Diarylimine Iron Complexes

Selective Extraction of N₂ from Air by Diarylimine Iron Complexes

Date: January 30, 2013
Creator: Bartholomew, Erika R.; Volpe, Emily C.; Wolczanski, Peter T.; Lobkovsky, Emil B. & Cundari, Thomas R., 1964-
Description: This article discusses selective extraction of N₂ from air by diarylimine iron complexes.
Contributing Partner: UNT College of Arts and Sciences
CO₂ Reduction on Transition Metal (Fe, Co, Ni, and Cu) Surfaces: In Comparison with Homogeneous Catalysis

CO₂ Reduction on Transition Metal (Fe, Co, Ni, and Cu) Surfaces: In Comparison with Homogeneous Catalysis

Date: February 22, 2012
Creator: Liu, Cong; Cundari, Thomas R., 1964- & Wilson, Angela K.
Description: This article discusses CO₂ reduction on transition metal (Fe, Co, Ni, and Cu) surfaces. Heterogeneous catalysis is compared with the homogeneous models using transition metal β-diketiminato complexes, showing that both heterogeneous and homogeneous catalysis of CO₂ reduction display the same energetic trend as a function of metal.
Contributing Partner: UNT College of Arts and Sciences
Quantitative Computational Thermochemistry of Transition Metal Species

Quantitative Computational Thermochemistry of Transition Metal Species

Date: May 15, 2007
Creator: DeYonker, Nathan J.; Peterson, Kirk A.; Steyl, Gideon; Wilson, Angela K. & Cundari, Thomas R., 1964-
Description: This article discusses quantitative computational thermochemistry of transition metal species. The correlation consistent Composite Approach (ccCA), which has been shown to achieve chemical accuracy (±1 kcal mol⁻¹) for a large benchmark set of main group and s-block metal compounds, is used to compute enthalpies of formation for a set of 17 3d transition metal species.
Contributing Partner: UNT College of Arts and Sciences
Principal Resonance Contributors to High-Valent, Transition-Metal Alkylidene Complexes

Principal Resonance Contributors to High-Valent, Transition-Metal Alkylidene Complexes

Date: July 1991
Creator: Cundari, Thomas R., 1964- & Gordon, Mark S.
Description: This article discusses principal resonance contributors to high-valent, transition-metal alkylidene complexes. Stationary points on each potential energy surface are characterized and compared to experimental information where available; as long as a suitably flexible valence basis set is used, good agreement between theoretically calculated and experimentally determined geometries is obtained.
Contributing Partner: UNT College of Arts and Sciences
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