1. Institute for Inorganic Chemistry, University of ErlangenNürnberg, Egerlandstr. 1, 91058 Erlangen, Germany, Institute for Fundamental Research of Organic Chemistry, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, Japan, Karpov Institute of Physical Chemistry, 10, Vorontsovo Pole, 103064 Moscow, Russia, and Department of Chemistry, State University of New York, Stony Brook, New York 11794-3400