OK -- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Patrick Dupré pd520@xxxxxxxxxx University of York Department of Chemistry Heslington, York YO10 5DD United Kingdom Phone: +44-(0)-1904-434384 Fax: +44-(0)-1904-432516 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++