Formation of an Unusual Copper(II) Complex from the Degradation of a Novel Tricopper(II) Carbohydrazone Complex

E. Manoj, Cochin University of Science and Technology
M.R. Prathapachandra Kurup, Cochin University of Science and Technology
Rohith P. John, ISM University
M. Nethaji, Indian Institute of Science
Alex Punnoose, Boise State University

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Inorganic Chemistry Communications, Volume 12, Issue 10, 952-955.  DOI: 10.1016/j.inoche.2009.07.010

Abstract

An unusual copper(II) complex [Cu(L^1a)₂Cl₂] CH₃OH·H₂O·H₃O⁺Cl⁻ (1a) was isolated from a solution of a novel tricopper(II) complex [Cu₃(HL¹)Cl₂]Cl₃·2H₂O (1) in methanol, where L^1a is 3-(2-pyridyl)triazolo[1,5-a]-pyridine, and characterized with single crystal X-ray diffraction study. The tricopper(II) complex of potential ligand 1,5-bis(di-2-pyridyl ketone) carbohydrazone (H₂L¹) was synthesized and physico-chemically characterized, while the formation of the complex 1a was followed by time-dependant monitoring of the UV–visible spectra, which reveals degradation of ligand backbone as intensity loss of bands corresponding to O → Cu(II) charge transfer.