X-RAY AND NMR-STUDIES OF DIAMMONIUM (NITRILOTRIACETATO)DIOXOVANADATE(V) COMPLEX

New vanadium (V) complex, diammonium (nitrilotriacetato)dioxovanadate (V) has been synthesized. The structure of the complex has been studie d by NMR spectroscopies as well as X-ray crystallography. The unit cel l of the monoclinic crystals contains four molecules with a=6.923 (1) Angstrom, b=8.824 (2) Angstrom and beta=91.60 (3)degrees in the space group of P2(1)/n. The anion, [VO(2)NTA](2-) has irregular and distorte d octahedral geometry around vanadium with two double-bonded oxo atoms cis to each other. It is confirmed from NMR studies that the chemical exchange between glycinate rings cis to and trans to V=0 bond has occ urred fast in aqueous solution at elevated temperature.