* Corresponding authors

^a Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-2060, USA

^b Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-2060, USA

^c Molecular & Cell Biology, University of Connecticut, Storrs, Connecticut 06269-2060, USA
E-mail: challa.kumar@uconn.edu
Fax: +1-860-486-2981
Tel: +1-860-486-3213

^d Inorganic and Physical Chemistry Department, Indian Institute of Science, Bengaluru, Karnataka 560012, India