1. Departments of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, Norwegian University of Science and Technology, NTNU, N-7491 Trondheim, Norway, University of Connecticut, Storrs, Connecticut 06269, Mt. Holyoke College, South Hadley, Massachusetts 01075, and Wesleyan University, Middletown, Connecticut 06459-0180