Estudo ab-initio da a-alanina em meio aquoso
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
01/07/1999
|
Resumo |
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Ab initio Hartree-Fock (HF), Density Functional (B3LYP) and electron correlation (MP2) methods have been used to caracterize the aqueous medium intramolecular hydrogen bond in a-alanine. The 6-31G* and 6-31++G** were taken from Gaussian94 library. We were concerned on the structure of three conformers of a-alanine, in their neutral form plus on the structure of the zwitterionic form (Z). The Z structure is a stationary point at the HF/6-31G* level but it is not when diffuse functions and electron correlation are included. This results shows that the Z form does not exist in the gas phase. The inclusion of solvent effects changed significantly the results obtained in gas phase, therefore this inclusion make the Z form a stationary point within all level of theory, and the relative energy depends dramatically on the level of calculation. |
Formato |
501-505 |
Identificador |
http://dx.doi.org/10.1590/S0100-40421999000400006 Química Nova. Sociedade Brasileira de Química, v. 22, n. 4, p. 501-505, 1999. 0100-4042 http://hdl.handle.net/11449/27562 10.1590/S0100-40421999000400006 S0100-40421999000400006 WOS:000081587600006 2-s2.0-0004631658 |
Idioma(s) |
por |
Publicador |
Sociedade Brasileira de Química |
Relação |
Química Nova |
Direitos |
openAccess |
Palavras-Chave | #ab initio #a-alanine #solvent |
Tipo |
info:eu-repo/semantics/article |