X-ray and NMR Studies of Diammonium (Nitrilotriacetato)dioxovanadate (V) Complex

Abstract

New vanadium (V) complex, diammomum (nitrilotriacetato)dioxovanadate (V) has been synthesized. The structure of the complex has been studied by NMR spectzoscopies as well as X-ray crystallography. The unit cell of the monoclinic crystals contains four molecules with a=6.923 (1) Å, b=8.824 (2) Å and β =91.60 (3)° in the space group of P2₁/n. The anion, [VO₂NTA]^2- has irregular and distorted 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=O bond has occurred fast in aqueous solution at elevated temperature.