MONOMERIC AND 1D POLYMERIC Cu(II) COMPLEXES DERIVED FROM DICYANAMIDE: STRUCTURAL CHARACTERIZATION AND ANTIBACTERIAL PROP
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MONOMERIC AND 1D POLYMERIC Cu(II) COMPLEXES DERIVED FROM DICYANAMIDE: STRUCTURAL CHARACTERIZATION AND ANTIBACTERIAL PROPERTIES S. N. K. Kurtar1*, F. Koçer2, and M. Kose2
Monomeric [Cu(DCA–OEt)2] and polymeric [Cu(DCA)2(DMF)2]n complexes (where DCA is dicyanamide, DCA–OEt is in situ formed ligand, and DMF is dimetylformamide) derived from sodium dicyanamide are synthesized and their structures are characterised by spectroscopic and analytical methods. Molecular structures of the complexes are determined by single crystal X-ray diffraction studies. In the structure of the polymeric complex [Cu(DCA)2(DMF)2]n, the DCA anions are bridges between Cu(II) ions through the terminal nitrile N atoms, forming a 1D ladder-like coordination polymer chains. The DCA–OEt ligand in the monomeric [Cu(DCA–OEt)2] complex is formed by the nucleophilic addition of ethanol to the DCA nitrile groups, resulting in a bidentate chelate ligand. The antibacterial activity of the structurally characterised complexes are evaluated by by agar-well diffusion. The complexes exhibit a comparable antibacterial activity against some bacteria to the standart antibiotics (amikacin and gentamicin). DOI: 10.1134/S0022476620080168 Keywords: dicyanamide, Cu(II) complexes, X-ray, antibacterial activity.
INTRODUCTION Recently, the engineering of metal structures has gained importance due to their physical chemical and mechanical properties [1]. When the literature on chemical evolution is reviewed, it is seen that dicyanamide has been playing an important role for a long time. Due to different bridging methods and diverse magnetic properties, there is growing interest in the dicyanamide ligand [2]. Metal dicyanamide (DCA) coordination polymers constitute an important subject of research due to their interesting structural features along with the magnetic properties related to this ligand [3]. By controlling the favoured geometry of ligands and metals, many new and exciting structures have been reported, which often display a beautiful and intricate entanglement of multiple networks. DCA is a great molecule that plays a major role in medical and industrial applications. DCA has been used extensively as a building block in supramolecular chemistry and crystal engineering [4]. DCA is used as a base material for the production of melamine and for resin and amino plastics in industry. DCA and its derivatives are also of biological interest, and their antibacterial and antifungal activities have been investigated as medical, crop protection agents and antiseptics for industry products, food, and other goods for daily use [5]. DCA and cyanamide (monomer of DCA) have been reported to interact with aldehyde dehydrogenases in liver [6]. The DCA
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Materials Science and Engineering Department, Kahramanmaraş Sutcu Imam University, Kahramanmaras, Turkey; *[email protected]. 2Chemistry Department, Kahramanmaras Sutcu Imam University, Kahramanmaras, Turkey. Original article submitted October 17, 2019; revised November 19, 2019; accepted December 3, 2019. 1296
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