Coordination Compounds of Cobalt(II), Nickel(II), and Copper(II) Halides with 2-Methyl-1,2,4-Triazolo[1,5-a]benzimidazole

Abstract

New coordination compounds of Co(II), Ni(II), and Cu(II) halides with 2-methyl-1,2,4-triazolo[1,5-a]benzimidazole (L), [Co(L)₂Cl₂] (Ia), [Ni(L)₂(H₂O)₄]Cl₂ · 4H₂O (II), and [Сu₂(L)₄(µ-Br)₂Br₂] (IIIa), are synthesized. The complexes are studied by X-ray structure analysis (СIF files CCDC nos. 1825006–1825008), electronic (diffuse reflectance) spectroscopy, and IR spectroscopy. In compounds Ia, II, and IIIa, ligand L is coordinated to the metal by the N⁴ atom of the triazole fragment. The study of the cytotoxic effect of the ligand and synthesized complexes on the Hep-2 line (laryngeal cancer cells) shows a considerably higher activity of the copper(II) complex than that of the ligand.