ASSIGNMENT OF THE GEOMETRIC ISOMERS OF BIS(L-ASPARTATO)COBALTATE(III) ION BY PROTON NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY

Abstract

Abstract The three possible geometric isomers of bis(L-aspartato)-cobaltate(III) ion each give a twelve-line ABX pmr spectrum at 100 MHz. The parameters from analysis of the spectra have been used to calculate line positions and intensities which compare favorably with those observed. The conformation of the CH[sbnd]CH2 moiety in the flexible six-membered chelate ring is calculated from the vicinal coupling constants. The geometric configurations are assigned using the proton chemical shifts. The results are compared to those for N,N′-ethylenediamine-disuccinatocobaltate(III) ion.