1. Department of Chemistry and NIS Centre, University of Torino, Via Giuria 7, 10125 Torino, Italy
2. Department of Chemical and Pharmaceutical Sciences, University of Trieste, Piazzale Europa 1/Via L. Giorgieri 1, 34127 Trieste, Italy
3. NMR Science and Development Division, RIKEN SPring-8 Center, and Nano-Crystallography Unit, RIKEN-JEOL Collaboration Center, Yokohama, Kanagawa 230-0045, Japan
4. JEOL Resonance Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan