Electronic structure of oxovanadium IV complexes of alpha-hydroxycarboxylic acids.
A series of V(IV)O bis chelated complexes of alpha-hydroxycarboxylic acids with a 2(COO(-), O(-)) coordination set was analyzed by electronic absorption and EPR spectroscopy in aqueous solution. All the complexes exhibit a square-pyramidal geometry distorted toward trigonal bipyramid. The influence of the distortion of the geometry, as deduced from the steric hindrance produced by the substituents at the alpha-carbon atom of the ligands, on the spectroscopic parameters has been studied. The observed trends were related to the electronic structure of the metal ion in the distorted geometry.
Garribba
Eugenio
E
Dipartimento di Chimica, Università degli Studi di Sassari, Via Vienna 2, 07100 Sassari, Italy. micera@uniss.it
Micera
Giovanni
G
Panzanelli
Angelo
A
Sanna
Daniele
D