Unusual template condensation of benzophenone thiosemicarbazones and salicylaldehydes with nickel(II)

Abstract

Reactions of 5-R-2-hydroxybenzophenone S-methylthiosemicarbazones (R: H, Br, Cl) and 2-hydroxy-benzaldehydes in the presence of NiCl₂ yielded template complexes by chelating with two of the ligands in the monoanionic form. The N₄O₂ complexes of the thiosemicarbazones show distorted-octahedral geometry around nickel(II). The compounds were characterized by elemental analysis, conductivity and magnetic measurements, UV-Vis, IR, ¹H-NMR, and mass spectra. Crystal structure of bis-N¹-(2-hydroxy-5-bromo-phenyl)(phenyl)methylene-N⁴-(2-hydroxy-phenyl)methylene-S-methyl-thiosemicarbazidato-Ni(II) was determined by single-crystal X-ray diffraction.

Keywords:

• Thiosemicarbazone
• Benzophenone
• Template condensation
• N₄O₂ complex
• X-ray crystal structure

Acknowledgment

This work was supported by the Research Fund of Istanbul University, Project No. 256/23082004.