1. Institut für Chemie, Humboldt-Universtät zu Berlin, Brook-Taylor-Strasse 2, D-12489 Berlin, Germany, H. Kollataj University of Agriculture, Department of Chemistry, Mickiewicz Ave. 24/26, 30-059 Cracow, Poland, and CPMOH-Université de Bordeaux 1, 351 Cours de la Libération, 33405 Talence, France