1. Department
of Chemistry, Pohang University of Science and Technology, San 31
Hyoja-dong, Pohang 790-784, Korea
2. Responsive Organic
Materials Laboratory, RIKEN 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
3. Institute
of Chemistry, Academia Sinica, 128 Academic Road Sec. 2, Nankang, Taipei 115, Taiwan