PEROXO AMINOPOLYCARBOXYLATO VANADATE(V) OF AN UNUSUALLY LOW TOXICITY - SYNTHESIS AND STRUCTURE OF THE VERY STABLE K-2[VO(O-2)(C6H6NO6)]CENTER-DOT-2H2O

摘要

The synthesis and structure of a monoperoxo vanadate(V) of the formula K-2[VO(O-2)NTA]. 2H(2)O, where NTA=C6H6NO63-, the nitrilotriacetate, is described. This stable compound crystallizes in the orthorhombic system (space group Pna2(1)): a=7.621(1), b=13.002(3), c=13.155(1) Angstrom. A tetradentate NTA encloses vanadium in a distorted pentagonal bipyramid with an apical V=O group. Cis to it, in the pentagonal plane, a non-symmetrically coordinated peroxo group is located with an (O-O) bond length of 1.438(4) Angstrom. Complex IR spectra display rich absorption due to coordinated NTA, in addition to the characteristic V=O and (O-O) stretching vibrations. Aqueous solutions of the complex show a (peroxo-->V(V)) charge transfer band at lambda(max)=425 nm. [References: 29]