1. Laboratory for Precipitation Processes, Division of Materials Chemistry, Ruđer Bošković Institute, P. O. Box 180, 10002 Zagreb, Croatia, Fax: (internat.) + 385‐1‐4680098
2. Dipartimento di Chimica “G. Ciamician”, Università degli Studi, via Selmi 2, 40126 Bologna, Italy
3. Laboratory for Magnetic Resonance, Division of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, 10002 Zagreb, Croatia