A Switchable Molecular Rotator: Neutron Spectroscopy Study on a Polymeric Spin-Crossover Compound

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• 作者：J. Alberto Rodr铆guez-Velamaz谩n ; Miguel A. Gonz谩lez ; Jos茅 A. Real ; Miguel Castro ; M. Carmen Mu帽oz ; Ana B. Gaspar ; Ryo Ohtani ; Masaaki Ohba ; Ko Yoneda ; Yuh Hijikata ; Nobuhiro Yanai ; Motohiro Mizuno ; Hideo Ando ; Susumu Kitagawa
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：March 21, 2012
• 年：2012
• 卷：134
• 期：11
• 页码：5083-5089
• 全文大小：372K
• 年卷期：v.134,no.11(March 21, 2012)
• ISSN：1520-5126

文摘

A quasielastic neutron scattering and solid-state ²H NMR spectroscopy study of the polymeric spin-crossover compound {Fe(pyrazine)[Pt(CN)b>4b>]} shows that the switching of the rotation of a molecular fragment鈥攖he pyrazine ligand鈥攐ccurs in association with the change of spin state. The rotation switching was examined on a wide time scale (10^鈥?3鈥?0^鈥? s) by both techniques, which clearly demonstrated the combination between molecular rotation and spin-crossover transition under external stimuli (temperature and chemical). The pyrazine rings are seen to perform a 4-fold jump motion about the coordinating nitrogen axis in the high-spin state. In the low-spin state, however, the motion is suppressed, while when the system incorporates benzene guest molecules, the movements of the system are even more restricted.