1. Department of Chemistry and the Materials Research Center; Northwestern University; 2145 Sheridan Road Evanston IL 60208 USA
2. Department of Chemistry; Chung-Ang University; 84 Heukseok-ro Dongjak-gu, Seoul 156-756 Republic of Korea
3. Polyera Corporation; 8045 Lamon Avenue Skokie IL 60077 USA