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TRUCTURE OF ORGANIC COMPOUNDS

Synthesis and Crystal Structure of Dichlorido{2-[(4-Methoxyphenyl)iminomethyl]pyridine-k2N,N'}zinc M. Khalaja,* a

Department of Chemistry, Buinzahra Branch, Islamic Azad University, Buinzahra, Iran *e-mail: [email protected] Received August 17, 2019; revised August 29, 2019; accepted September 4, 2019

Abstract—A coordination complex, [Zn(L)Cl2], consisting of ZnCl 2 and Schiff base bidentate ligand (4-methoxyphenyl)pyridine-2ylmethyleneamine (L) was prepared and structurally characterized. The coordination compound has been characterized by infrared spectroscopy, UV-visible spectroscopy, elemental analysis, and single-crystal X-ray diffraction. The compound crystallizes in the P 1 triclinic space group with a = 7.973(2) Å, b = 9.354(3) Å, c = 10.134(3) Å, and α = 81.013(6)°, β = 81.662(6)°, and γ = 70.855(6)°. The Zn(II) atom has a distorted tetrahedral coordination, in which the bidentate organic ligand is coordinated to the Zn(II) atom through two N atoms. In addition, the Zn(II) ion is located in a distorted tetrahedral environment, which is composed of the chelating ligand and two Cl ions. DOI: 10.1134/S106377452007010X

INTRODUCTION Different complexes with interesting structures and desirable properties are formed by reacting transition metals with +2 oxidation state with nitrogen donor ligands. The coordination complexes, which are formed by the rigid and flexible nitrogen donor ligands, have been concentrated on in most of the recent publications in this area. Many attempts have been made so far to prepare various transition metal(II) complexes using ligands of different coordination capability. Unlike the coordination complexes of 3d (or 4d) transition metal ions, the formation of compounds with heavy metal ions such as Zn(II) has been rarely reported. In some of its complexes, Zn(II) has a prominent capability of self-assembling in different fashions by coordination bridges between metal ions or such non-classical bonds as π–π stacking and hydrogen bonds to yield structures with 0D, 1D, 2D, and 3D frameworks [1–7]. A variety of coordination configurations such as trigonal planar, square planar, tetrahedral, and octahedral is shown by Zn(II) ion in such structures [8, 9]. Zn(II) compounds have appealing characteristics making them potentially applicable in paper industry, paints, thermometers, manometers, fluorescent lamps, and Zinc batteries [10]. The applications of Zn(II) compounds have been increasingly developed in biological inorganic chemistry [11, 12]. Many Schiff bases and their metal complexes have been studied given their interesting biological properties such as ability to reversibly bind with oxygen, biological modeling applications as well as antibacterial, anticancer, antifungal, herbicidal activities [13–15]. Metal complexes

of Schiff bases usually show biologically enhanced activity compared with free ligand [16–18]. In continuation of our ongoing research, Zn(II) complexes with (4-methoxyphenyl) pyridine-2ylmethyleneamine ligand have been synthesized a