1. Contribution from the Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR. Peoples' Republic of China; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-8175; Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439; Department of Physics and Astronomy, University of Wisconsin, Eau Claire, Wisconsin 54702; and Departamento de Quíimica, C-XIV and Instituto Universitario de Ciencia de...