1. Department of Chemistry, University of Houston, Houston, Texas 77204, Department of Chemistry, University of California, Davis, California 95616, Department of Material and Life Science, Osaka University, Suita, Osaka 565-0871, Japan, Materials Theory and Computational Department, Sandia National Laboratories, Albuquerque, New Mexico 87185-1349, and Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131