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https://hdl.handle.net/10316/10736
Título: | Oxygen-by-sulfur substitutions in glycine: conformational and vibrational effects | Autor: | Carvalho, Luís A. E. Batista de Marques, M. Paula M. Teixeira-Dias, José J. C. |
Data: | 1999 | Editora: | Royal Society of Chemistry | Citação: | Perkin Transactions 2. (1999) 2507-2514 | Título da revista, periódico, livro ou evento: | Journal of the Chemical Society, Perkin Transactions 2 | Número: | 11 | Resumo: | Molecular geometries, energies, dipole moments and atomic charges of several conformations of glycine (NH2CH2C(O)OH) and its oxygen-by-sulfur substituted analogues (NH2CH2C(O)SH, NH2CH2C(S)OH and NH2CH2C(S)SH) were determined by ab initio MO calculations at the MP2/6-31G** level, and vibrational frequencies, infrared and Raman intensities were evaluated within the harmonic approximation, at the HF/6-31G** level. Profiles for the potential energy and several geometric parameters as a function of the NC–C(X) (X = O, S) dihedral angle (C–C internal rotation) were obtained using the 3-21G(N*) basis set. Conformational and vibrational effects of oxygen-by-sulfur substitutions are discussed. In particular, the occurrence of intramolecular close contacts between the NH2CH2– and –C(X)YH (X, Y = O or S) moieties of the molecule is considered, for some of the most stable conformations of each analogue. As a general trend, the results clearly point to the stabilisation of the G/anti forms (:NCC 60°, NCCX 180°), highlighting the importance of the N:· · ·H(Y) and N:· · ·S(H) interactions, e.g. in conformers G/anti/s-trans for the thione form (X = S) and G/anti/s-cis for the thiol one (Y = S), respectively. | URI: | https://hdl.handle.net/10316/10736 | ISSN: | 0300-9580 | DOI: | 10.1039/a905073f | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Ciências da Vida - Artigos em Revistas Internacionais FCTUC Química - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
---|---|---|---|---|
Oxygen-by-sulfur substitutions in glycine.pdf | Artigo | 268.61 kB | Adobe PDF | Ver/Abrir |
Optimized geometries and calculated atomic.doc | Tabelas | 100 kB | Microsoft Word | Ver/Abrir |
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