Photophysics of 2-hydroxypyridine: An ab Initio study

Andrzej L. Sobolewski; Ludwik Adamowicz

doi:10.1021/jp950852z

Photophysics of 2-hydroxypyridine: An ab Initio study

Andrzej L. Sobolewski, Ludwik Adamowicz

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Abstract

The potential energy (PE) surfaces of the electronic ground and the lowest excited states relevant to photophysics of interconversion of the 2-hydroxypyridine/2(1H)-pyridone system are characterized by ab initio calculations. The energy calculations at the optimized geometries are performed with the aid of the second-order perturbation theory, employing the complete-active-space self-consistent-field (CASSCF) wave function as the reference (CASPT2). Results confirm the earlier hypothesis based on the CASSCF calculations (Chem. Phys. Lett. 1993, 211, 293) that the photoinduced dissociation-association (PIDA) mechanism is probably responsible for excited-state tautomerization observed in this system. Absorption of the second photon in the excited electronic state is suggested to provide the "driving" force for the PIDA mechanism.

Original language	English (US)
Pages (from-to)	3933-3941
Number of pages	9
Journal	Journal of physical chemistry
Volume	100
Issue number	10
DOIs	https://doi.org/10.1021/jp950852z
State	Published - Mar 7 1996

ASJC Scopus subject areas

General Engineering
Physical and Theoretical Chemistry

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title = "Photophysics of 2-hydroxypyridine: An ab Initio study",

abstract = "The potential energy (PE) surfaces of the electronic ground and the lowest excited states relevant to photophysics of interconversion of the 2-hydroxypyridine/2(1H)-pyridone system are characterized by ab initio calculations. The energy calculations at the optimized geometries are performed with the aid of the second-order perturbation theory, employing the complete-active-space self-consistent-field (CASSCF) wave function as the reference (CASPT2). Results confirm the earlier hypothesis based on the CASSCF calculations (Chem. Phys. Lett. 1993, 211, 293) that the photoinduced dissociation-association (PIDA) mechanism is probably responsible for excited-state tautomerization observed in this system. Absorption of the second photon in the excited electronic state is suggested to provide the {"}driving{"} force for the PIDA mechanism.",

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AU - Sobolewski, Andrzej L.

AU - Adamowicz, Ludwik

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N2 - The potential energy (PE) surfaces of the electronic ground and the lowest excited states relevant to photophysics of interconversion of the 2-hydroxypyridine/2(1H)-pyridone system are characterized by ab initio calculations. The energy calculations at the optimized geometries are performed with the aid of the second-order perturbation theory, employing the complete-active-space self-consistent-field (CASSCF) wave function as the reference (CASPT2). Results confirm the earlier hypothesis based on the CASSCF calculations (Chem. Phys. Lett. 1993, 211, 293) that the photoinduced dissociation-association (PIDA) mechanism is probably responsible for excited-state tautomerization observed in this system. Absorption of the second photon in the excited electronic state is suggested to provide the "driving" force for the PIDA mechanism.

AB - The potential energy (PE) surfaces of the electronic ground and the lowest excited states relevant to photophysics of interconversion of the 2-hydroxypyridine/2(1H)-pyridone system are characterized by ab initio calculations. The energy calculations at the optimized geometries are performed with the aid of the second-order perturbation theory, employing the complete-active-space self-consistent-field (CASSCF) wave function as the reference (CASPT2). Results confirm the earlier hypothesis based on the CASSCF calculations (Chem. Phys. Lett. 1993, 211, 293) that the photoinduced dissociation-association (PIDA) mechanism is probably responsible for excited-state tautomerization observed in this system. Absorption of the second photon in the excited electronic state is suggested to provide the "driving" force for the PIDA mechanism.

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Photophysics of 2-hydroxypyridine: An ab Initio study

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