Ferromagnetic exchange coupling in a new bis(μ-chloro)-bridged copper(II) Schiff base complex: Synthesis, structure, magnetic properties and catalytic oxidation of cycloalkanes

Santarupa Thakurta, Partha Roy, Georgina Rosair, Carlos J. Gómez-García, Eugenio Garribba, Samiran Mitra

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Abstract

A new (µ-chloro)-bridged complex [Cu(HL)Cl]2 · H2O (1) with the Schiff base ligand H2L, [2-((E)-(2-hydroxyethylimino)methyl)-4-bromophenol], has been synthesized and characterized by elemental analysis, IR, UV-Vis and EPR spectroscopic studies. X-ray diffraction studies show that 1 is a binuclear CuII complex with a pair of chlorine atoms bridging the copper atoms in a central Cu2Cl2 core. Each copper atom in 1 adopts a distorted square-pyramidal geometry with the imine nitrogen atom, alkoxy and phenoxy oxygen atoms from the Schiff base ligand and a bridging chlorine atom constructing the basal plane, while the apical position of the pyramid is occupied by the other bridging chlorine atom. Variable temperature susceptibility measurements show that complex 1 presents the highest ferromagnetic coupling [J = +43.2(5) cm-1] reported till date in any doubly chloro-bridged CuII dimer, and a weak interdimer antiferromagnetic coupling [J' = -0.276(8) cm-1]. The complex also exhibits high catalytic activity towards the oxidation of hydrocarbons using H2O2 as terminal oxidant. © 2009 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)695-702
Number of pages8
JournalPolyhedron
Volume28
Issue number4
DOIs
Publication statusPublished - 12 Mar 2009

Keywords

  • Bis(μ-chloro)-bridge
  • Catalytic activity
  • Ferromagnetic
  • Schiff base

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