Synthesis, Characterization and Crystal Structure of Bis[4-Methyl-1-{1-(Pyridin-2-Yl)Ethylidene} Thiosemicarbazide-Κ3s,N,N]Zinc(II)

Abstract

Schiff base ligand (4-methyl-1-(1-(pyridin-2-yl)ethylidene)thiosemicarbazide (H2L) was synthesized via condensation of 2-acetylpyridine and 4-methyl-3-thiosemicarbazide in ethanol. The Zn(II) complex was obtained from 2:1 (H2L/Zn(OAc)2.2H2O) molar ratio reaction, yielding a neutral compound formulated as [Zn(HL)2]. Elemental analysis, 1H and 13C NMR, conductance measurements and FT-IR spectroscopy were used for the characterization of the ligand and the complex. The complex is non-electrolyte in DMF solution. The structure of the complex was determined by single crystal X-ray diffraction study. Two ligand coordinated the Zn(II) ion. Each of the azomethine ligand was coordinated to Zn(II) ion through one azomethine nitrogen atom, one pyridine nitrogen atom and one sulfur atom, yielding an octahedral Zn(II) complex. The compound crystallizes in the triclinic space group P-1 with unit cell dimensions a = 8.551 (6) Å, b = 10.948 (5) Å, c = 12.060 (4) Å, a = 91.66 (3)°, b = 100.03 (5)°, g = 109.92 (3)°,  V = 1040.5 (10) Å3, Z = 2, R1 = 0.066 and wR2 = 0.158. The Zn(II) cation in N4S2 inner is situated in a distorted octahedral environment.