1. Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, Chemistry Department, Tamkang University, Tamsui 25137, Taiwan, Dow Chemical Company, Texas Operations, Freeport, Texas 77451-3257, and Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794-2275