1. Department of Chemistry, University of New Brunswick, Fredericton, NB E3B 5A3, Canada, Fax: +1‐506‐453‐4981, http://www.unb.ca/fredericton/science/chem/passmore/
2. Department of Chemistry, P. O. Box 3000, 90014 University of Oulu, Finland, Fax: +358‐8‐553‐1603