1. Department of Chemistry, The University of Akron, Akron, Ohio 44325-3601
2. Department of Chemistry and Biochemistry, University of Delaware, 102 Brown Lab, Newark, Delaware 19716
3. Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, m/c 0358, Urey Hall 5128, La Jolla, California 92093-0358
4. Department of Chemistry and Biochemistry, University of Massachusetts at Dartmouth, North Dartmouth, Massachusetts 02747