1. W.M. Keck Center for Molecular Electronics and Department of Chemistry, Syracuse University, Syracuse, New York 13244; Department of Electrical & Computer Engineering, Syracuse University, Syracuse, New York 13244; Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269; Genencor International, Inc., Palo Alto, California 94304; and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269