a
Department of Chemistry, The University of Burdwan, Burdwan 713104, India
E-mail: barin_1@yahoo.co.uk
;
Fax: +91-342-2530452
;
Tel: +91-342-2533913
b
Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
E-mail: tmaji@jncasr.ac.in
;
Fax: (+91) 80 2208 2766
;
Tel: (+91) 80 2208 2826
c
Departament de Química Inorgánica, Universitat de Barcelona, Diagonal, 647, 08028 Barcelona, Spain