Synthesis and structural characterization of Cd(II) complexes with 2-acetylpyridine-aminoguanidine - a novel coordination mode

The structures of the first two complexes with bidentate coordination aminoguanidine Schiff base, i.e., 2-acetylpyridine-aminoguanidine (L), are reported. complex formula [Cd2Cl6(HL)2] (1) was obtained in reaction warm aqueous solutions chloride salts Cd(II), Zn(II) and ligand, while cadmium bromide ligand presence deprotonating agent as well ammonium thiocyanate resulted formation which base has both role counterion, viz., [HL][Cd(HL)(NCS)2XY]?H2O (2), where X is Cl- or Br-, Y Br- SCN-. were characterized by IR spectroscopy, elemental analysis, conductometric measurements single crystal X-ray diffraction. unusual lead to significant changes geometry this molecule (from almost planar free form a tridentate twisted ligand). Besides, 1 relatively rare bridging octahedral Cd(II) found, structure 2 exhibits substitutional disorder, contains four different anions: [Cd(HL)(NCS)2Br(SCN)]- (ca. 61 %), [Cd(HL)(NCS)2Cl(SCN)]- 35 [Cd(HL)(NCS)2Br2]- 3 %) [Cd(HL)(NCS)2ClBr]- %).