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

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Mirjana Radanović
Slađana Novaković
Marko Rodić
Ljiljana Vojinović-Ješić
Christoph Janiak
Vukadin Leovac


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


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M. Radanović, S. Novaković, M. Rodić, L. Vojinović-Ješić, C. Janiak, and V. Leovac, “Synthesis and structural characterization of Cd(II) complexes with 2-acetylpyridine-aminoguanidine – a novel coordination mode: Scientific paper”, J. Serb. Chem. Soc., Sep. 2022.
Inorganic Chemistry

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