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González-Vázquez J, Martínez-Núñez E, Fernández-Ramos A, Vázquez SA. Dissociation of Difluoroethylenes. II. Direct Classical Trajectory Study of the HF Elimination from 1,2-Difluoroethylene. J Phys Chem A 2003. [DOI: 10.1021/jp021902k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Jesús González-Vázquez
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela, E-15706, Spain
| | - Emilio Martínez-Núñez
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela, E-15706, Spain
| | - Antonio Fernández-Ramos
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela, E-15706, Spain
| | - Saulo A. Vázquez
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela, E-15706, Spain
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Abstract
Ab initio MP2/6-31G(d,p) and density functional theory B3LYP/6-31G(d,p) calculations were performed to investigate the molecular structure of the active part of flavins in the oxidized and reduced forms, using lumiflavin as a model compound. The possible aromatic character of these systems was explored by using the following aromaticity indexes: nucleus-independent chemical shifts, the anisotropy of the magnetic susceptibility, the Bird index, and natural bond orbital analysis. To provide further insight, calculations on the 2+ charged species were also carried out. Both the MP2 and B3LYP computations predict a planar conformation for the oxidized form and a bent structure for the reduced form, in agreement with previous experience. For both the oxidized and reduced states, ring A is found to be the most aromatic, as expected. The calculations suggest that the folding in the reduced form is mainly a result of electronic preferences rather than steric hindrance.
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Affiliation(s)
- Jesús Rodríguez-Otero
- Departamento de Química Física, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Spain
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Affiliation(s)
- J. R. Flores
- Departamento de Química Física, Facultade de Ciencias, Universidade de Vigo, Lagoas-Marcosende, 36200 Vigo, Spain and Departamento de Química Física, Facultade de Química, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - E. Martínez-Núñez
- Departamento de Química Física, Facultade de Ciencias, Universidade de Vigo, Lagoas-Marcosende, 36200 Vigo, Spain and Departamento de Química Física, Facultade de Química, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - S. A. Vázquez
- Departamento de Química Física, Facultade de Ciencias, Universidade de Vigo, Lagoas-Marcosende, 36200 Vigo, Spain and Departamento de Química Física, Facultade de Química, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - F. J. Gómez
- Departamento de Química Física, Facultade de Ciencias, Universidade de Vigo, Lagoas-Marcosende, 36200 Vigo, Spain and Departamento de Química Física, Facultade de Química, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
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Martínez-Núñez E, Vázquez SA, J. C. Varandas A. Unimolecular reaction dynamics of HSO. Analysis of the influence of different barrier samplings on the product energy distributions. Phys Chem Chem Phys 2001. [DOI: 10.1039/b107511j] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Martínez-Núñez E, Borges I, Vázquez SA. Rate constants for the CH3O + NO → CH3ONO reaction by classical trajectory and canonical variational transition state theory calculations. J PHYS ORG CHEM 2001. [DOI: 10.1002/poc.460] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Affiliation(s)
- E. Martínez-Núñez
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra, Portugal
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Martínez-Núñez E, Vázquez SA. Anharmonic Quasiclassical Barrier Samplings in Trajectory Calculations and Their Influence on the Computed Product Energy Distributions. J Phys Chem A 2001. [DOI: 10.1021/jp004267w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Emilio Martínez-Núñez
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela E-15706, Spain
| | - Saulo A. Vázquez
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela E-15706, Spain
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Martínez-Núñez E, Peña-Gallego A, Rodríguez-Fernández R, Vázquez S. Direct dynamics simulation of the methanethiol cation decomposition. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)00591-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Peña-Gallego A, Martínez-Núñez E, Vázquez SA. Dynamics of the cis–trans isomerization and Cl–O dissociation of chlorine nitrite. Classical trajectory and statistical calculations. Phys Chem Chem Phys 2000. [DOI: 10.1039/b003891l] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Affiliation(s)
- Emilio Martínez-Núñez
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela E−15706, Spain
| | - Saulo A. Vázquez
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela E−15706, Spain
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Peña-Gallego A, Martínez-Núñez E, Vázquez SA. Classical Trajectory Study of the Cis−Trans Isomerization and F−O Dissociation of FONO. J Phys Chem A 1998. [DOI: 10.1021/jp982532w] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Angeles Peña-Gallego
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela E-15706, Spain
| | - Emilio Martínez-Núñez
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela E-15706, Spain
| | - Saulo A. Vázquez
- Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela E-15706, Spain
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Fernández-Ramos A, Martínez-Núñez E, Ríos MA, Rodríguez-Otero J, Vázquez SA, Estévez CM. Direct Dynamics Study of the Dissociation and Elimination Channels in the Thermal Decomposition of Methyl Nitrite. J Am Chem Soc 1998. [DOI: 10.1021/ja9809307] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Antonio Fernández-Ramos
- Contribution from the Departamento de Química Física, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Galicia, Spain, and Departamento de Química Física y Química Orgánica, Facultad de Ciencias de Vigo, Universidad de Vigo, Vigo, Galicia, Spain
| | - Emilio Martínez-Núñez
- Contribution from the Departamento de Química Física, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Galicia, Spain, and Departamento de Química Física y Química Orgánica, Facultad de Ciencias de Vigo, Universidad de Vigo, Vigo, Galicia, Spain
| | - Miguel A. Ríos
- Contribution from the Departamento de Química Física, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Galicia, Spain, and Departamento de Química Física y Química Orgánica, Facultad de Ciencias de Vigo, Universidad de Vigo, Vigo, Galicia, Spain
| | - Jesús Rodríguez-Otero
- Contribution from the Departamento de Química Física, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Galicia, Spain, and Departamento de Química Física y Química Orgánica, Facultad de Ciencias de Vigo, Universidad de Vigo, Vigo, Galicia, Spain
| | - Saulo A. Vázquez
- Contribution from the Departamento de Química Física, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Galicia, Spain, and Departamento de Química Física y Química Orgánica, Facultad de Ciencias de Vigo, Universidad de Vigo, Vigo, Galicia, Spain
| | - Carlos M. Estévez
- Contribution from the Departamento de Química Física, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Galicia, Spain, and Departamento de Química Física y Química Orgánica, Facultad de Ciencias de Vigo, Universidad de Vigo, Vigo, Galicia, Spain
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