1. Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland
2. School of Science and Technology, Chemistry Division, University of Camerino, via S. Agostino n. 1, 62032 Camerino, Italy
3. Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, 56124 Pisa, Italy
4. Department of Inorganic and Analytical Chemistry, University of Geneva, 1211 Geneva, Switzerland
5. Department of Physical Chemistry, University of Geneva, 1211 Geneva, Switzerland
6. Laboratory of Crystallography, University of Geneva, Quai Ernest Ansermet 24, 1211 Geneva 4, Switzerland