Synthesis and characterization of some heterobimetallic complexes of Cu, Zn and Mn derived from succinoyldihydrazones

Department of Chemistry, Centre for Advance Studies in Chemistry, North Eastern Hill University,

Shillong-793 022, Meghalaya, India

E-mail : ralal@rediffmail.com

Department of Chemistry, Faculty of Science and Agriculture, The University of West-Indies, St-Augustine,

Trinidad and Tobago, West-Indies

Manuscript received online 25 June 2014, revised 25 October 2014, accepted 04 November 2014

Heterobimetallic Cu, Zn and Mn complexes [ZnCu(Lⁿ )(CH₃OH)₃ ].xCH₃OH ((H₄L ¹ ) (1), H₄L ² (2); x = 0, 1), and [MnCu(Lⁿ )(CH₃OH)₃ ].xCH₃OH ((H₄L ¹ (3), H₄L ² (4), x = 0, 1) (H₄L ¹ = disalicylaldehydesuccinoyldihydrazone, H₄L ² = bis(2-hydroxy-1-naphthaldehyde)succinoyldihydrazone) have been synthesized using monometallic copper complexes as metalloligand in methanol medium. Complexes have been characterized by means of elemental analysis, molar conductance, UV-Vis, IR spectroscopy, magnetic moment and ESR. The µ_eff value for the Zn^II-Cu^II complexes fall in the range 1.73– 1.75 B.M. while for Mn^II-Cu^II complexes fall in the region 3.24–3.43 B.M. Electronic spectroscopy suggests that the copper centre has a pseudo square pyramidal stereochemistry in all the complexes while the second metal centre has a distorted octahedral stereochemistry. The dihydrazones are present in enol form in the complexes. The electron transfer reactions of the complexes have been investigated by cyclic voltammetry.