| Budget Amount *help |
¥15,540,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥840,000)
Fiscal Year 2007: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2006: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 2005: ¥7,600,000 (Direct Cost: ¥7,600,000)
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| Research Abstract |
Ionic Liquids have complicated molecular structures, and intramolecular and intermolecular interactions are overlapped over the range of 300-700 pm. In the present study, we aimed to isolate these interactions using X-ray scattering and theoretical DFT and MD simulation. Finally, we succeeded to extract not only short range cation-anion interactions, but also long range cation anion, cation-cation and anion-anion interactions in the range of < 2000 pm. Such a long-range interaction has been obtained for the first time over the world, and this method of approach can be applied for various types of ionic liquids. Indeed, this method of approach was applied for ionic liquids composed of imidazolium and pyrolidinium cations with varying length of alkyl chains, and the space distribution of anions around the cation, and detailed atom-atom interactions can be extracted.
On the other hand, ionic liquids composed of alkylammonium ions anions are called as protic ionic liquids. Protic ionic liquids involve dissociable protons, and a part of protons within cations are transferred to anions to give acid and base molecules. The extent of proton transfer is expressed in terms of K_IL= [acid] [base], and the K_IL, is a measure of the acid-base property of protic ionic liquids. We determined the K_IL, value of ethylanmmonium nitrate ionic liquid directly by potentiometry using an IS FET (ion-selective field-effect transistor) electrode, for the first time over the world The K_IL, value strongly depends on the nature of anion, the hydrogen bonding ability of which usually leads to a Jorge K_IL, (or small pK_IL).
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