点击次数：

论文类型：期刊论文

发表时间：2013-09-15

发表刊物：COMPUTATIONAL AND THEORETICAL CHEMISTRY

收录刊物：SCIE、Scopus

卷号：1020

页面范围：57-62

ISSN号：2210-271X

关键字：M@C-74; Relativistic DFT; Energy potential surface; Dynamic NMR; Raman

摘要：The interaction between M (M = Ba, Sr) and C-74 (D-3h) was investigated by the relativistic DFT. With the representative patch of C-74 (D-3h), all the possible isomers, transition states, and energy barriers were studied. Optimized structures show that there are three equivalent isomers, with Ba or Sr located about 1.7 angstrom off-center. According to the minimum energy pathway, the possible movement trajectory of Ba or Sr in the C-74 (D-3h) cage was predicted. The energy barriers for Ba and Sr hopping from one stable site to another are 8.30 and 7.88 kcal mol(-1), respectively. According to the trajectory, the NMR spectra of M@C-74 (M = Ba, Sr) was predicted. When the Ba or Sr was encapsulated into the C-74 cage, the symmetry of M@C-74 (M = Ba, Sr) changes from D-3h to C-2v, and the blue shift of the Raman vibrational mode within 100-200 cm(-1) of M@C-74 was found. (C) 2013 Elsevier B.V. All rights reserved.