Multiple Equilibria Interaction Pattern between the Ionic Liquids C(n)mimPF(6) and beta-Cyclodextrin in Aqueous Solutions
文献类型：期刊论文
| 作者 | Zhang, Jingjing; Shen, Xinghai |
| 刊名 | JOURNAL OF PHYSICAL CHEMISTRY B
 |
| 出版日期 | 2011-10-20 |
| 卷号 | 115期号:41页码:11852-11861 |
| ISSN号 | 1520-6106 |
| DOI | 10.1021/jp206418m |
| 英文摘要 | The interactions of ionic liquids (ILs) 1-alkyl-3-methylimidazolium hexafluorophosphate (C(n)mimPF(6), n = 2, 4, 6, 8) with beta-cyclodextrin (beta-CD) in aqueous solutions are investigated in this article. The stoichiometry and apparent association constants were obtained by the competitive fluorescence method, NMR measurements, and isothermal titration calorimetry (ITC). The results showed that C(2)mimPF(6), C(4)mimPF(6), and C(6)mimPF(6) form 1:1 (guest:host) inclusion complexes with beta-CD whereas the 1:2 inclusion complex can be formed between C(8)mimPF(6) and beta-CD. We studied the existence state of the ILs and found that they exist mainly as separated ions with a minor percentage existing as associated ion pairs within the concentration studied. By ESI/HRMS, the coexistence of different complexes including C(n)mim(+).PF6- -beta-CD, C(n)mim(+) -beta-CD (or C(n)mim(+) -beta-CD2), and PF6- -beta-CD was observed. It is also deduced that the intermediate complex, (beta-CD cation).(anion beta l-CD), may dissociate into cation beta-CD and anion beta-CD complexes. Thermodynamic parameters determined by ITC indicate that, while the inclusion process for C(6)mimPF(6)/beta-CD complex is entropy and enthalpy driven, the interactions of other C(n)mimPF(6) (n = 2, 4, 8) with beta-CD are enthalpy controlled. Based on these results, a more comprehensive pattern involving multiple equilibria on the interaction between C(n)mimPF(6) and beta-CD in aqueous solutions is presented herein. |
| 语种 | 英语 |
| WOS记录号 | WOS:000295700700011 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/73313]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Shen, Xinghai |
| 作者单位 | Peking Univ, Coll Chem & Mol Engn, Radiochem & Radiat Chem Key Lab Fundamental Sci, BNLMS, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Jingjing,Shen, Xinghai. Multiple Equilibria Interaction Pattern between the Ionic Liquids C(n)mimPF(6) and beta-Cyclodextrin in Aqueous Solutions[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2011,115(41):11852-11861. |
| APA | Zhang, Jingjing,&Shen, Xinghai.(2011).Multiple Equilibria Interaction Pattern between the Ionic Liquids C(n)mimPF(6) and beta-Cyclodextrin in Aqueous Solutions.JOURNAL OF PHYSICAL CHEMISTRY B,115(41),11852-11861. |
| MLA | Zhang, Jingjing,et al."Multiple Equilibria Interaction Pattern between the Ionic Liquids C(n)mimPF(6) and beta-Cyclodextrin in Aqueous Solutions".JOURNAL OF PHYSICAL CHEMISTRY B 115.41(2011):11852-11861. |
入库方式： OAI收割
来源：化学研究所
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