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Multiple Equilibria Interaction Pattern between the Ionic Liquids C(n)mimPF(6) and beta-Cyclodextrin in Aqueous Solutions
Zhang, Jingjing; Shen, Xinghai
2011-10-20
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
ISSN1520-6106
Volume115Issue:41Pages:11852-11861
AbstractThe 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.
DOI10.1021/jp206418m
Indexed BySCI
Language英语
WOS IDWOS:000295700700011
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/73314
Collection中国科学院化学研究所
Corresponding AuthorShen, Xinghai
AffiliationPeking Univ, Coll Chem & Mol Engn, Radiochem & Radiat Chem Key Lab Fundamental Sci, BNLMS, Beijing 100871, Peoples R China
Recommended Citation
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.
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