Long-range J(N-15,C-13) and J(C-13,C-13) coupling constants via the metal atom in C-13 NMR spectra of square-planar Ni(II) complexes of the Schiff base of (S)-2-(N-benzylprolyl)aminobenzophenone and C-13-1-, C-13-2- or N-15-labelled glycine

摘要

Chiral synthons containing either C-13- Or N-15-labelled glycine were prepared. The C-13 and N-15 NMR spectra of the Ni(II) complex of the Schiff base of (S)-2-(N-benzylprolyl)aminobenzophenone and C-13-1-, C-13-2- or N-15-labelled glycine were measured and assigned. The observed splitting of the carbon signals is due to long-range J(C-13,C-13) and J(N-15,C-13) couplings. The mutual influence of nuclei is transferred via the central Ni(II) atom in square-planar complexes. (C) 1998 John Wiley & Sons, Ltd. [References: 15]