Long-range spin-spin interactions in the 13C-n.m.r. spectra of the nickel(II) complex of the Schiff base of (S)-N-benzylproline (2-benzoylphenyl)amide and glycine. Quantum-chemical calculations and possible donation of electron density from the π-system of the benzyl group to nickel

Journal article, 2003

Long-range [nJ(13C, 13C), nJ(15N, 15N) and nJ(15N, 13C)] interactions in the 13C-n.m.r. spectra of CDCl3 solutions of selectively labeled nickel(II) complexes of the Schiff base derived from (S)-N-benzylproline (2-benzoylphenyl)amide and glycine provide experimental evidence for the necessity of the donation of electron density from the π-system of the benzyl ring to the nickel orbitals. No such interactions were observed in (2H)DMSO solutions, where the complex exists in a different conformation.