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Palluccio TD, Germain ME, Marazzi M, Temprado M, Silvia JS, Müller P, Cummins CC, Davis JV, Serafim LF, Captain B, Hoff CD, Rybak-Akimova EV. Binding of Nitriles and Isonitriles to V(III) and Mo(III) Complexes: Ligand vs Metal Controlled Mechanism. Inorg Chem 2023. [PMID: 37377337 DOI: 10.1021/acs.inorgchem.3c00595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
The synthesis and structures of nitrile complexes of V(N[tBu]Ar)3, 2 (Ar = 3,5-Me2C6H3), are described. Thermochemical and kinetic data for their formation were determined by variable temperature Fourier transform infrared (FTIR), calorimetry, and stopped-flow techniques. The extent of back-bonding from metal to coordinated nitrile indicates that electron donation from the metal to the nitrile plays a less prominent role for 2 than for the related complex Mo(N[tBu]Ar)3, 1. Kinetic studies reveal similar rate constants for nitrile binding to 2, but the activation parameters depend critically on the nature of R in RCN. Activation enthalpies range from 2.9 to 7.2 kcal·mol-1, and activation entropies from -9 to -28 cal·mol-1·K-1 in an opposing manner. Density functional theory (DFT) calculations provide a plausible explanation supporting the formation of a π-stacking interaction between a pendant arene of the metal anilide of 2 and the arene substituent on the incoming nitrile in favorable cases. Data for ligand binding to 1 do not exhibit this range of activation parameters and are clustered in a small area centered at ΔH‡ = 5.0 kcal·mol-1 and ΔS‡ = -26 cal·mol-1·K-1. Computational studies are in agreement with the experimental data and indicate a stronger dependence on electronic factors associated with the change in spin state upon ligand binding to 1.
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Affiliation(s)
- Taryn D Palluccio
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, United States
| | - Meaghan E Germain
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, United States
| | - Marco Marazzi
- Departamento de Química Analítica, Química Física e Ingeniería Química, Grupo de Reactividad y Estructura Molecular (RESMOL), Universidad de Alcalá, Alcalá de Henares, Madrid 28805, Spain
- Instituto de Investigación Química 'Andrés M. del Río'' (IQAR), Universidad de Alcalá, Alcalá de Henares, Madrid 28805, Spain
| | - Manuel Temprado
- Departamento de Química Analítica, Química Física e Ingeniería Química, Grupo de Reactividad y Estructura Molecular (RESMOL), Universidad de Alcalá, Alcalá de Henares, Madrid 28805, Spain
- Instituto de Investigación Química 'Andrés M. del Río'' (IQAR), Universidad de Alcalá, Alcalá de Henares, Madrid 28805, Spain
| | - Jared S Silvia
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Peter Müller
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Christopher C Cummins
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Jack V Davis
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Leonardo F Serafim
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Burjor Captain
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Carl D Hoff
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Elena V Rybak-Akimova
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, United States
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Germain ME, Temprado M, Castonguay A, Kryatova OP, Rybak-Akimova EV, Curley JJ, Mendiratta A, Tsai YC, Cummins CC, Prabhakar R, McDonough JE, Hoff CD. Coordination-Mode Control of Bound Nitrile Radical Complex Reactivity: Intercepting End-on Nitrile−Mo(III) Radicals at Low Temperature. J Am Chem Soc 2009; 131:15412-23. [PMID: 19919164 DOI: 10.1021/ja905849a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Meaghan E. Germain
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - Manuel Temprado
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - Annie Castonguay
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - Olga P. Kryatova
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - Elena V. Rybak-Akimova
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - John J. Curley
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - Arjun Mendiratta
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - Yi-Chou Tsai
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - Christopher C. Cummins
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - Rajeev Prabhakar
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - James E. McDonough
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
| | - Carl D. Hoff
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, and Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146
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