Crystal Structure of a Bis[1-(benzothiazole-2yl-2κN)(2-Pyridylmethyliden-1κN)(hydrazino-2κN)] Cobalt(II) Complex

I. Thiam, Papa Aly Gaye, M. Sow, O. Diouf, P. Retailleau, M. Gaye
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Abstract

The Schiff base 1-(benzothiazol-2-yl)(2-pyridylmethylidene)hydrazine (HL) was synthesis via a condensation of 1-(benzo[d]thiazol-2-yl)hydrazine and 2-pyridine carboxaldehyde in methanol in 1:1 molar ratio reaction. The crystal structure of a mononuclear complex Bis[1-(benzothiazole-2yl-2κN)(2-pyridylmethyliden-1κN)(hydrazino-2κN)] cobalt(II) complex (1) (CoC26H20N8S2) was obtained by the reaction of HL with Co(CH3COO)2.4H2O, in 2:1 ratio, in methanol at room temperature. The ligand and the complex are characterized by IR, and physical measurement. The spectroscopic study shows that the Schiff base possesses five potential donor sites. Upon coordination the results show that the ligand acts in tridentate mode. Suitable crystals of the compound 1 were grown by slow evaporation of methanol solution for one week. The structure of 1 was elucidated by X-ray diffraction analysis. The compound crystallizes in the monoclinic crystal system with a space group of P21/c. The asymmetric unit of compound 1 contains a mononuclear complex in which the cobalt ion is coordinated to two monodeprotonated molecules of the Schiff base. Each of the ligand molecule acts through three nitrogen atoms. The Co(II) center is hexacoordinated and the environment is best described as a distorted octahedral geometry. The two ligand molecules occupy mean planes which are quasi-perpendicular with a dihedral angle of 89.77(2)°. Each molecule of complex is connected to its neighbor via hydrogen bond of type C–H•••S resulting in chains along b axis.
双[1-(苯并噻唑-2yl-2κ n)(2-吡啶基甲基-1κ n)(肼基-2κ n)]钴(II)配合物的晶体结构
以1-(苯并噻唑-2-基)肼和2-吡啶甲醛为原料,在甲醇中以1:1的摩尔比缩合反应合成了希夫碱1-(苯并噻唑-2-基)(2-吡啶基甲基)肼(HL)。在室温下,HL与Co(CH3COO)2.4H2O以2:1的比例在甲醇中反应,得到了单核配合物Bis[1-(苯并噻唑-2yl-2κ n)(2-吡啶基甲基-1κ n)(肼基-2κ n)]钴(II)配合物(1)(CoC26H20N8S2)的晶体结构。通过红外光谱和物理测量对配体和配合物进行了表征。光谱研究表明,希夫碱具有5个潜在的供体位点。配位结果表明配体以三齿模式作用。化合物1在甲醇溶液中缓慢蒸发一周,生长出合适的晶体。x射线衍射分析证实了1的结构。该化合物在单斜晶系中结晶,空间群为P21/c。化合物1的不对称单元包含一个单核配合物,其中钴离子与两个单去质子化的希夫碱分子配位。每个配体分子通过三个氮原子起作用。Co(II)中心是六协调的,环境最好描述为一个扭曲的八面体几何。两个配体分子占据准垂直的平均平面,其二面角为89.77(2)°。配合物的每个分子通过C-H•••S型氢键与其相邻分子相连,形成沿b轴的链。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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