1. Canada Research Chair on Electroactive and Photoactive Polymers, Département de Chimie, Université Laval, Quebec City, Quebec, G1K 7P4, Canada, Institute of Microstructural Sciences, National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada, and Laboratoire de Photophysique Moléculaire, Département de Chimie, Université de Montreal, C.P. 6128, Succ. Centre-Ville, Montreal, Quebec, H3C 3J7, Canada