1. Department of Chemistry and Biochemistry, Faculty of Engineering, Center for Molecular Systems (CMS), Kyushu University, Moto-oka 744, Nishi-ku, Fukuoka 819-0395, Japan
2. Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106, United States
3. PRESTO, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan