Electron-molecular vibration coupling in (DMtTTF)Br and (o-DMTTF)2[W6O19] salts studied by vibrational spectroscopy
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- 作者：Andrzej 艁api艅ski ; Damian Jankowski ; Roman 艢wietlik ; Eric W. Reinheimer ; Marc Fourmigu茅
- 关键词：DMtTTF and o-DMTTF salts ; IR and Raman spectroscopy ; Electron-molecular vibration (EMV) coupling effect ; Dimer model
- 刊名：Synthetic Metals
- 出版年：February, 2014
- 年：2014
- 卷：188
- 期：Complete
- 页码：92-99
- 全文大小：1197 K
文摘
A novel 1:1 salt encompassing radical cations of DMtTTF (DMtTTF = dimethyltrimethylene-tetrathiafulvalene) and the Br鈭?/sup>anion has been synthesized. Close inspection of the salt's solid state structure revealed the presence of quasi-isolated dimers containing DMtTTF radical cations, a specific arrangement whereby the microscopic parameters of DMtTTF+ might be studied. Analysis of the corresponding single crystal IR and Raman spectra of (DMtTTF)Br allowed us to study the material's electronic and vibrational structure and to evaluate the electron-molecular coupling constants via the isolated dimer model. Additionally, using previously published IR data, analogous calculations were performed on the salt (o-DMTTF)2[W6O19] (o-DMTTF = o-3,4-dimethyltetrathiafulvalene), which also contains well isolated dimers of o-DMTTF radical cations. These calculations revealed that the coupling constants for the unsymmetrical donors studied herein are comparable to those for symmetric TTF derivatives.