1. Department of Chemistry, University College
of Science, University of Calcutta, 92,
A.P.C. Road, Kolkata-700 009, India
2. School of Chemistry, The University of Reading, P.O. Box 224, Whiteknights, Reading RG6 6AD, U.K.
3. Instituto de Ciencia Molecular (ICMol), Parque
Científico, Universidad de Valencia, Catedrático José Beltrán, 2. 46980 Paterna,
Valencia, Spain