Estudo espectroscopico de compostos de oxovanadio (IV)
AUTOR(ES)
Lucilene Gadelha de Queiroz
DATA DE PUBLICAÇÃO
1979
RESUMO
In this work we studied oxovanadium(IV) compounds, with the VO species coordinated to the following ligands: water, acetylacetone, thiocianate, 8-hydroxyquinoline, 2´,2´-bipyridyl, 1,10-phenantroline, 2,2 -bipyridylamine, oxalic acid and bissalicylaldehydeethylenediimine. Compounds having tne group VO are coordinated with a square pyramid structure. Thus, the infrared spectra of these compounds was measured in the region 800-1200cm to study the influence of the various ligands on the axial V=O bond. The results showed a shift of the V=O stretching frequency (950-1100 cm) indicating that the shift to lower frequencies is a direct consequence of the lowering of the donating capacity from the oxygen atom to the metal (pp - dp). We also studied the electronic spectra of the above compounds (400 - 800 nm), measuring three bands assigned to d-d transitions. Using the point group symetry C4v our results agree with those in the literature, the Ballhausen-Gray
ASSUNTO(S)
espectro infravermelho analise espectral
ACESSO AO ARTIGO
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