Estudo vibracional infravermelho de compostos isomorficos : M2C2O4.X CM=K, Rb, Cs; X=H2O, H2O2)

AUTOR(ES)
DATA DE PUBLICAÇÃO

1992

RESUMO

The infrared spectroscopy vibrational study of the compounds: M2C2O4.X (M= K, Rb, Cs; x= H2O, H2O2) was carried out, based on a comparative technique of these spectra and, when necessary, with the corresponding deuterated compounds. The spectra was obtained with a FTIR NICOLET 60SXB equipment, in the wave number range 4000 - 10 cm. The instrumental and optical parameter of measurements were optimized so as to obtain spectral resolutions of 1 cm in the middle region and of 2 cm in the low infrared region. ln the vibrational analysis the shift and splitting of the internal vibrations of oxalate ion by crystal field effect, as predicted by the factor group theory, was confirmed. These spectroscopic properties were discussed taking into account the variations of kinetic energy by mass effect, and the potential energy, by the junction of the mechanical coupling of the hydrogen bond with the electrostatic interaction of the cation. The internal vibrations of the water and hydrogen peroxide of cristalization, were also analysed in terms of hydrogen bonds. The external rotational vibrations of the water and hydrogen peroxide were attributed in relation to the substitutions: H2O/H2O2, H2O/D2O and H2O2/D2O2. Approximately eight bands were also observed and attributed to external modes of translation.

ASSUNTO(S)

espectroscopia de infravermelho espectros vibracionais

ACESSO AO ARTIGO

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