On the Contribution of Intramolecular Kinetics Properties of an Important Rotamer of Vinylpyranoanthocyanin-Phenol Pigment (Portisin)

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Alexandre R F Carvalho (Autor) Outra; Joana Oliveira (Autor) FCUP; Victor de Freitas (Autor) FCUP; Nuno Mateus (Autor) FCUP; Andre Melo (Autor) FCUP

Revista

Título: International Journal of Quantum Chemistry

Vol. 111

Páginas: 1355-1360

ISSN: 0020-7608

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 1 Citação

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-002-RAC

DOI: 10.1002/qua.22570

Abstract (EN): The kinetics of an important rotamerization occurring in vinylpyranoanthocyanin-phenol pigment (Portisin) was analyzed according to the transition state (TS) formalism. The relevant stationary states, the TS and the equivalent minima, were fully characterized. This included the optimization of the respective geometries and the analytical calculation of all vibrational frequencies. The reaction coordinate was identified, as associated with a single imaginary frequency in TS, and an appropriate intrinsic coordinate analysis (IRC) ensured that this state was connected with the correspondent equivalent minima. For the minimum, the harmonic and one-dimensional hindered rotor models were used to describe the reaction coordinate. The activation thermodynamics properties were then evaluated. The results obtained were interpreted according to the theoretical models assumed. The results are important for a prompt result for this group of portisins. (C) 2010 Wiley Periodicals, Inc. Int J Quantum Chem 111: 1355-1360, 2011

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6