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A Hexanucluear copper(II) Schiff base complex incorporating rare “bicapped cubane” core: structural aspects, magnetic properties and EPR study

Shit, Shyamapada and Nandy, Madhusudan and Rosair, Georgina and El Fallah, M. Salah and Ribas, Joan and Garribba, Eugenio and Mitra, Samiran (2013) A Hexanucluear copper(II) Schiff base complex incorporating rare “bicapped cubane” core: structural aspects, magnetic properties and EPR study. Polyhedron, Vol. 52 , p. 963-969. eISSN 1873-3719. Article.

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DOI: 10.1016/j.poly.2012.07.016

Abstract

The reaction of Cu2(CH3COO)4·2H2O with the Schiff base ligand, H4L [(OH)2C6H3CH=N–C(CH3)(CH2OH)2], yields a novel hexanuclear copper (II) cluster {[Cu6(HL)4]·CH3OH·0.5CH3CN·6.5H2O} (1) with a rare “bicapped cubane” core. Title complex has been characterized by different physico-chemical techniques. Single-crystal X-ray structure reveals that the “bicapped cubane” core was formed by a cubane-like Cu4O4 subcore capped by two copper(II) atoms over opposite faces. The cubane copper(II) atoms are in distorted square pyramidal geometry and connected each other via μ3-alkoxo oxygens while two apical copper(II) atoms are in distorted square planar environments and connected to the main cubane subcore by doubly phenoxo bridged oxygen atoms. EPR spectra of the complex reveals overall strong antiferromagnetic behavior, well supported by cryomagnetic susceptibility measurements in the range 2–300 K under the magnetic field of 0.1 T leading different coupling constants: J1 = +60 cm−1, J2 = −45.5 ± 1 cm−1; J3 = −140 ± 1 cm−1, using the general Hamiltonian H = −J(Si·Sj). A plausible magneto-structural correlation has also been established.

Item Type:Article
ID Code:8674
Status:Published
Refereed:Yes
Uncontrolled Keywords:Hexanuclear copper(II) complex, Schiff base, bicapped cubane core, X-ray structure, antiferromagnetic coupling, EPR spectra
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Elsevier Science
eISSN:1873-3719
Deposited On:22 Feb 2013 10:20

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