1. Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuta-cho, Yokohama, Kanagawa 226-8502, Japan, Bio-Photonics Group, Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan, Department of Chemistry, University of Houston, Texas 77204, and Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany