1. Department of Chemistry and Analytical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA,
U.K.
2. A.N. Nesmeyanov Institute
of Organoelement Compounds (INEOS), Russian Academy of Sciences, 28 Vavilov Street, B-334, Moscow 119991, Russia
3. EPSRC National Crystallography
Service, School of Chemistry, University of Southampton, Southampton, SO17 1BJ U.K.