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Keywords:

  • Schiff-base ligand;
  • Dinuclear complexes;
  • Crystal structures;
  • Magnetic properties

Abstract

A novel versatile multidentate ligand 2-(benzothiazol-2-yl-hydrazonomethyl)-6-methoxyphenol (HL), was obtained from a condensation reaction between 2-hydrazino benzothiazole and o-vanillin. The reactions of HL with CuCl2·2H2O/Mn(ClO4)2·6H2O generated two novel dinuclear compounds Cu2L(μ-Cl)Cl2(CH3OH)2 (1) and Mn2L3(ClO4)(CH3CH2OH)3 (2). The crystal structures of 1 and 2 were determined by X-ray diffraction studies. The two copper atoms in complex 1 are connected by a L anion and a single chloro bridge with a Cu···Cu separation of 3.2729(4) Å. In complex 2, the two manganese atoms are held together by two L anion bridges and the Mn···Mn separation amounts to 3.3433(7) Å. As expected, variable-temperature magnetic susceptibility measurements of complex 1 showed strong antiferromagnetic intramolecular coupling between the copper(II) atoms with J = –102.2 cm–1, and evidenced for complex 2 weak antiferromagnetic coupling with J = –1.68 cm–1.