Affiliation: | 1. Institut für Organische Chemie and Interdisciplinary Center for Molecular Materials, Friedrich‐Alexander‐Universit?t, Erlangen‐Nürnberg, Henkestrasse 42, 91054 Erlangen, Germany, Fax: (+49)?9131‐8526865;2. New permanent address: Department of Chemistry, Texas A&M University, PO Box 30012, College Station, TX 77842‐3012, USA, Fax: (+1)?979‐8455629 |