Synthesis and characterization of several rhenium(I) complexes of 2-acetylpyridine and ferrocenyl carbaldehyde derivatives of 2-hydroxybenzoic acid hydrazide

The rhenium(I) carbonyl halide (X = Cl and Br) complexes of the ligands derived from 2-acetylpyridine and ferrocenyl carbaldehyde derivatives of 2-hydroxybenzoic acid hydrazide have been prepared. The ligand forms a five-membered chelate ring but in the pyridine ligands it is Npyridine,N′-bidentate while it is O,N-bidentate in the ferrocene complexes.