Shirota Hideaki, Wishart James F, Castner Edward W
Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, USA.
J Phys Chem B. 2007 May 10;111(18):4819-29. doi: 10.1021/jp067126o. Epub 2007 Apr 7.
The intermolecular interactions and dynamics of novel ionic liquids with alkylsilyl and alkylsiloxy substitutions on the cations are studied by measuring the intermolecular vibrational spectra and reorientational dynamics using femtosecond Kerr effect methods. The new ionic liquids include 1-dimethylphenylsilylmethyl-3-methylimidazolium (PhSi-mim+), and 1-methyl-3-pentamethyldisiloxymethylimidazolium (SiOSi-mim+) cations paired with the bis(trifluoromethylsulfonyl)imide (NTf(2)-) anion. Measured ionic liquid viscosities are surprisingly low for such bulky cation substituents. DFT electronic structure calculations on the isolated ions provide additional information about the electrostatic interactions.
通过使用飞秒克尔效应方法测量分子间振动光谱和重取向动力学，研究了阳离子上具有烷基硅基和烷基硅氧基取代的新型离子液体的分子间相互作用和动力学。新型离子液体包括与双（三氟甲基磺酰基）亚胺（NTf(2)-）阴离子配对的1-二甲基苯基硅基甲基-3-甲基咪唑鎓（PhSi-mim+）和1-甲基-3-五甲基二硅氧甲基咪唑鎓（SiOSi-mim+）阳离子。对于如此庞大的阳离子取代基，测得的离子液体粘度出奇地低。对孤立离子进行的DFT电子结构计算提供了有关静电相互作用的更多信息。
