Mono- and binuclear Schiff base complexes derived from glycine, 3-acetylpyridine and transition metal ions

Binuclear Schiff base complexes derived from glycine (Gly) and 3-acetylpyridine (3-APy) in the presence of M(OAc)₂ [M = Co^II, Ni^II, Cu^II, Zn^II and Cd^II] have been synthesized. The role of pH in promoting the condensation of glycine and 3-acetylpyridine, as well as the substitution of acetates by hydroxide ion, has been discussed. Also, the reaction of glycine with 3-acetylpyridine in the presence of MCl₂ [M = Co^II and Ni^II] and MCl₃ [M = Fe^III and Cr^III] yields mono- and/or binuclear complexes containing both of glycine and 3-acetylpyridine without condensation. Both types of complex were isolated and characterized by chemical analysis, conductance, spectral (u.v.–vis., i.r., and ¹H-n.m.r.), magnetic and thermal measurements.