Nuclear Magnetic Resonance Study of Metal Complexes. I. A Conformational Analysis of d-(l)-Propylenediamine Chelate Rings of Diamagnetic Cobalt(III), Palladium(II) and Platinum(II) Complexes

Proton magnetic resonance (PMR) spectra of tetracyano-l-propylenediamine cobalt(III) ion and bis(l-propylenediamine) platinum(II) and palladium(II) ion have been measured in deuterated water and analyzed according to Castellano and Waugh’s exact analysis. The values of coupling constants clearly indicate that the l-propylenediamine chelate rings in these diamagnetic complexes have fixed λ-gauche form in aqueous solutions at room temperature.