1. L. V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of the Ukraine, Prospekt Nauki 31, Kiev, 252039 Ukraine, Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, Department of Chemistry, Howard University, Washington, DC 20059, and Department of Chemistry, Memorial University, St. John's, NFD, Canada A1B 3X7