1. Contribution from the Department of Chemistry, Indiana University-Purdue University at Indianapolis (IUPUI), 402 North Blackford Street, Indianapolis, Indiana 46202, Institute of Analytical Chemistry, University of Vienna, Währingerstrasse 38, A-1090 Vienna, Austria, Unitat de RMN d'Alt Camp, Serveis Cientificio Tècnics, Universitat de Barcelona, Marti i Franquès 1-11, E-08028 Barcelona, Spain, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351, Jyväskylä, Finland