頁籤選單縮合
題 名 | Aggregation Influence of Polyethyleneglycol Organic Solvents with Ionic Liquids BMIBF₄and BMIPF₆ |
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作 者 | 吳知易; 王浩丞; 蘇世剛; 龔世存; 林明緯; 林丞柏; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 57:1 2010.02[民99.02] |
頁 次 | 頁44-55 |
分類號 | 343.386 |
關鍵詞 | Ionic liquids; Nuclear magnetic resonance; HOESY; NOESY; Aggregation; Molecule Cluster; |
語 文 | 英文(English) |
英文摘要 | Polyethyleneglycol (PEG, M(subscript w)=200, 300, 400) and polyethyleneimine (PEI, M(subscript w)=423) are used to investigate the ion-ion interactions in liquids and physicochemical properties after the addition of PEG (or PEI) to ionic liquids 1-butyl-3-methylimidazole tetrafluoroborate (BMIBF4) or 1-butyl-3-methylimidazoliumhexafluorophosphate (BMIPF6). Nuclear magnetic resonance is used to investigate the effects of solvent content (x=0.05, 0.1, 0.2, 0.3, 0.4, 0.5) and temperature (303-338 K) on the diffusion coefficient, chemical shift, and two dimensional NOESY, HOESY spectra. HOESY spectra show that a hydrogen bond forms between the alkyl hydrogen of PEG and the 19F atom of BF4(superscript -) and PF6(superscript -). After the addition of PEG to BMIBF4 (or BMIPF6), the aggregation is the dominant effect for the diffusion coefficient result. When the molecular weight and the concentration of PEG increase, the effect of coving generates larger clusters involving PEG, BMI(superscript +) and its counter anion. The BF4(superscript -) group of the BMIBF4/PEG system is smaller than PF6(superscript -), it's easier to generate clusters in the BMIBF4/PEG system than it is in the BMIPF6/PEG system. |
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