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-1κ<I>N</I>)(hydrazino-2κ<I>N</I>)] cobalt(II) complex (1) (CoC<sub>26</sub>H<sub>20</sub>N<sub>8</sub>S<sub>2</sub>) was obtained by the reaction of HL with Co(CH<sub>3</sub>COO)<sub>2</sub>.4H<sub>2</sub>O, 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 <I>P</I>2<sub>1</sub>/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 <i>b</i> axis.
Highlights
Benzothiazole is a heterocycle which contains five or six membered rings with heteroatoms such as nitrogen, oxygen, or sulfur
Benzothiazole derivatives are used in the synthesis of heterocyclic dyes with high performance, via a coupling reaction with dicarbonyl
We describe the crystal structure of a cobalt(II) complex constructed with the tridentate monodeprotonated ligand 1-(benzothiazol-2-yl)(2-pyridylmethylidene)hydrazine which acts through three soft donating nitrogen atoms provided by the pyridine ring, the imino function and the benzothiazole heterocycle
Summary
Benzothiazole is a heterocycle which contains five or six membered rings with heteroatoms such as nitrogen, oxygen, or sulfur. The coordination mode depends on the adopted synthetic procedures It was found a deprotonated form of a benzothiazole/pyridone ligand acting in two tridentate fashions according to ligand/metal ratio: in 2/1 ratio yielding a mononuclear nickel (II) complex and in 1/1 ratio yielding a tetranuclear copper (II) complex in which the ligand act as bridge [10]. In this context, for synthesis of the cobalt (II) complex, the monodeprotonated Schiff base 1-(benzothiazol-2-yl)(2pyridylmethylidene)hydrazine (HL), which provides four potentially soft-donating atoms from one pyridine ring, one imino function, one benzothiazole nitrogen atom and one sulfur benzothiazole atom was used together. We describe the crystal structure of a cobalt(II) complex constructed with the tridentate monodeprotonated ligand 1-(benzothiazol-2-yl)(2-pyridylmethylidene)hydrazine which acts through three soft donating nitrogen atoms provided by the pyridine ring, the imino function and the benzothiazole heterocycle
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