1. Contribution from the Canada Research Chair on Electroactive and Photoactive Polymers, Département de Chimie, Université Laval, Quebec City, Quebec, Canada, G1K 7P4, Institute of Microstructural Sciences, National Research Council of Canada, Ottawa, Ontario, Canada, K1A 0R6, Laboratory of X-ray Diffraction, Department of Chemistry, Université de Montréal, Montreal, Quebec, Canada, H3C 3J7, and Département de Chimie, Université Laval, Quebec City, Quebec, Canada, G1K 7P4