Oxovanadium(IV) complexes with aromatic aldehydes |
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Authors: | Pessoa J C Cavaco I Correia I Tomaz I Duarte T Matias P M |
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Institution: | Centro Química Estrutural, Instituto Superior Tecnico, Lisbon, Portugal. pcjpessoa@popsrv.ist.utl.pt |
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Abstract: | The synthesis, structure and spectroscopic properties of complexes with the formula V(IV)O(dsal)2(H2O)], where Hdsal = salicylaldehyde, o-vanillin and 3-ethoxysalicylaldehyde, are presented. The crystal and molecular structures of V(IV)O(o-van)2(H2O)] (1) (o-Hvan = o-vanillin = 3-methoxysalicylaldehyde) is studied by single-crystal X-ray diffraction. Each molecule exhibits an octahedral geometry with the two o-van ligands coordinated cis to the V(IV)O2+ group. 1 is the first example of a structurally characterized vanadium complex involving O(aldehyde) as the donor atom and this enables a comparison between the bonding characteristics and the contributions of O(aldehyde), O(amide), O(carboxylate) and O(ketone) (in acetylacetone) to the parallel hyperfine coupling constant in VOL2 complexes. |
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