a
Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, USA
b
Department of Chemistry, University of Illinois at Urbana–Champaign, Urbana, USA
E-mail: jsmoore@illinois.edu
c
College of Optical Sciences, University of Arizona, Tucson, USA
d
Department of Materials Science and Engineering, University of Utah, Salt Lake City, USA
E-mail: lzang@eng.utah.edu
;
Fax: +1 801-585-0625
;
Tel: +1 801-587-1551