1. Contribution from the Department of Chemistry, University of Oklahoma, Stillwater, Oklahoma 74078, Department of Chemistry and the W. M. Keck Center for Molecular Electronics, Syracuse University, Syracuse, New York 13244-4100, Department of Colloid Chemistry, Attila József University, Szeged H-6720, Aradi V.t.1, Hungary, and Department of Physics, State University of New York at Albany, Albany, New York 12222