1. Institute of Pharmacy and Food Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Institute of Inorganic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Institute of Physical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, and Institute of Physical Chemistry, University of Jena, Helmholtzweg 4, D-07743 Jena, Germany