Electron spin resonance study of aqueous vanadyl tartrate solutions

Abstract

Complex satellite lines flanking the central e.s.r. spectra of vanadyl tartrate complexes in aqueous solution are interpreted in terms of triplet–singlet transitions made weakly allowed because of the large hyperfine coupling. Two distinct complexes were detected, one having J≈ 1190 G, favoured in the pH range 3–5, and the other having J≈ 680 G, reaching a maximum in the pH range 2–4. Their composition appears to be two vanadyl ions to each tartrate. Attempts to detect similar satellites using other ligands and other cations have failed.