Stereospecific formation of alpha-hydroxycarboxylato oxo peroxo complexes of vanadium(V). Crystal structure of (NBu4)2[V2O2(O2)2(L-lact)2] x 2H2O and (NBu4)2[V2O2(O2)2(D-lact)(L-lact)] x 2H2O.
An overview of structurally characterized alpha-hydroxycarboxylatodioxo- and alpha-hydroxycarboxylatooxoperoxovanadates(V) is presented and the geometric parameters of the V2O2 bridging core are discussed. The first case of a stereospecific formation of oxoperoxovanadates(V) is reported: The crystal structures of the isomeric compounds (NBu4)2[V2O2(O2)2(L-lact)2] x 2H2O and (NBu4)2[V2O2(O2)2(D-lact)(L-lact)] x 2H2O (lact = C3H4O3(2-), the anion of the lactic acid) differ mainly in the arrangement of the V2O2 core and in mutual orientation of the V=O bonds. The complexes with achiral ligands adopt the same structural type as the complexes formed from a racemic mixture of a chiral ligand, while the structure obtained using an enantiopure L,L-hydroxycarboxylate is different.
Schwendt
P
P
Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovak Republic. schwendt@fns.uniba.sk
Svancárek
P
P
Smatanová
I
I
Marek
J
J
D018360:Crystallography, X-Ray; D004055:Differential Thermal Analysis; D008024:Ligands; D015394:Molecular Structure; D013237:Stereoisomerism; D014638:Vanadates / Q000138:chemical synthesis* / Q000737:chemistry; D014961:X-Ray Diffraction
D008024:Ligands; D014638:Vanadates