1. Department of Chemistry, Buffalo State College, 1300 Elmwood Avenue, Buffalo, New York 14222-1095, Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan, Department of Chemistry, United States Naval Academy, Annapolis, Maryland 21402-5026, and Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0212