Oxovanadium(IV) complexes with aromatic aldehydes.
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.
Pessoa
J C
JC
Centro Química Estrutural, Instituto Superior Tecnico, Lisbon, Portugal. pcjpessoa@popsrv.ist.utl.pt
Cavaco
I
I
Correia
I
I
Tomaz
I
I
Duarte
T
T
Matias
P M
PM
D000447:Aldehydes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004578:Electron Spin Resonance Spectroscopy; D006841:Hydrocarbons, Aromatic / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013329:Structure-Activity Relationship; D014638:Vanadates / Q000737:chemistry*
D000447:Aldehydes; D006841:Hydrocarbons, Aromatic; D014638:Vanadates