1. Molecular Logic Gate Laboratory, Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) 373‐1 Guseong‐dong, Yuseong‐gu, Daejeon, 305‐701, Republic of Korea, Fax: +82‐42‐350‐2810
2. Molecular Materials Laboratory, Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 373‐1 Guseong‐dong, Yuseong‐gu, Daejeon, 305‐701, Republic of Korea
3. Department of Chemistry and Centre for Electro‐ and Photo‐Responsive Molecules, Korea University, Seoul, 136‐701, Republic of Korea