1. Institute
of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
2. Institut
für Anorganische und Analytische Chemie, Justus-Liebig Universität, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
3. Institute Laue-Langevin, Rue Jules
Horowitz 6, BP 156, 38042 Grenoble Cedex 9, France
4. Faculty
of Natural Sciences, Keele University, Staffordshire ST5 5BG, United Kingdom
5. Centro Universitario de la Defensa de Zaragoza, Ctra Huesca s/n, 50090 Zaragoza, Spain
6. Mulliken
Center for Theoretical Chemistry, Institute of Physical and Theoretical
Chemistry, University Bonn, Beringstraße 4, 53115 Bonn, Germany