Time-dependent density functional theory study on the hydrogen bonding-induced twisted intramolecular charge-transfer excited states of 2-(4'-N, N-dimethylaminophenyl)imidazo[4, 5-b]pyridine. - Shu-Hui Yin; Yufang Liu; Wei Zhang 002; Ming-Xing Guo; Peng Song 021 (J. Comput. Chem., 2010)