NMR Study of the Structures of Ni(II) Complexes of Schiff Bases of 2-Bromoglycine with (S)-2-((N-Benzylprolyl)amino)benzophenone or (S)-2-((N-Benzylprolyl)amino)- 5-chlorobenzophenone

The structure of a hydrolytically unstable Ni(II) complex of Schiff base of 3a with 2-bromoglycine was confirmed by NMR and 252 Cf plasma desorption mass spectrometry; a new more hydrolytically stable chloro derivate 4a was prepared and investigated by 2D NMR.