1. Contribution from the Department of Inorganic, Analytical and Applied Chemistry, and Department of Organic Chemistry, University of Geneva, 30 quai E. Ansermet, CH-1211 Geneva 4, Switzerland, Laboratory of X-ray Crystallography, University of Geneva, 24 quai E. Ansermet, CH-1211 Geneva 4, Switzerland, Ecole Polytechnique Fédérale de Lausanne, Laboratory of Lanthanide Supramolecular Chemistry, BCH 1402, CH-1015 Lausanne, Switzerland, and Institut de Physique et Chimie des Matériaux de Strasbourg-IPCMS,...