1. Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie Street, 50-383 Wrocław, Poland, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, Department of Chemistry, University of Minnesota Duluth, 1303 Ordean Court, Duluth, Minnesota 55812, and Department of Chemistry, San José State University, One Washington Square, San José, California 95192-0101