1. Contribution from the Department of Chemistry, Division of Nano Sciences, and Center for Biomimetic Systems, Ewha Womans University, Seoul 120-750, Korea, Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Stanford, California 94309, Okazaki Institute for Integrative Bioscience, National Institutes of Natural Sciences, Okazaki, Aichi 444-8787, Japan, and Department of Chemistry, Stanford University, Stanford, California 94305