1. a Department of Chemistry , Ochanomizu University , Otsuka Bunkyo-ku, Tokyo 112-8610, Japan
2. b Faculty of Science and Technology , Hirosaki University , Hirosaki 036-8561, Japan
3. c Liquid Crystal Materials Division , Dainippon Ink & Chemicals, Inc. , 4472-1 Komuro, Ina-machi, Kitaadachi-gun, Saitama 362-8577, Japan
4. d Department of Chemistry and Materials Science , Tokyo Institute of Technology , O-okayama, Meguro-ku, Tokyo 152-8551, Japan