1. Laboratoire de Physico-Chimie Moléculaire (UMR 5803 CNRS), Université Bordeaux I, 351, cours de la Libération, F-33405 Talence cedex, France, Chemistry Department, Moscow State University, Moscow, 119899 Russia, and Theoretical Chemistry Department, Institute of Chemistry, Chemical Research Center of HAS, Pusztaszeri út 59-67, H-1025 Budapest, Hungary