a
Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
E-mail: absk@chem.iitkgp.ernet.in
;
Fax: +91 3222 282552
;
Tel: +91 3222 283300
b
Department of Biotechnology, Indian Institute of Technology, Kharagpur 721302, India
c
Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, UK