View in EDS

Spectroscopic Evidencefor Unusual Microviscosityin Imidazolium Ionic Liquid and Tetraethylene Glycol Dimethyl EtherCosolvent Mixtures.

Saved in:
Bibliographic Details
Title: Spectroscopic Evidencefor Unusual Microviscosityin Imidazolium Ionic Liquid and Tetraethylene Glycol Dimethyl EtherCosolvent Mixtures.
Authors: Li, Boxuan1, Wang, Yingying1, Wang, Xuefei1, Vdovic, Silvije1, Guo, Qianjin1, Xia, Andong1
Source: Journal of Physical Chemistry B. Nov2012, Vol. 116 Issue 44, p13272-13281. 10p.
Subjects: Viscosity, Imidazoles, Ionic liquids, Ethylene glycol, Methyl ether, Benzopyrans, Emission spectroscopy
Abstract: The rotational dynamics of coumarin 153 (C153) in imidazolium-basedionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) and tetraethylene glycol dimethyl ether (TEGDME) mixturesacross all mole fractions have been investigated to determine thelocal viscosity of the microenvironment surrounding the probe molecules.The excimer-to-monomer fluorescence emission intensity ratio (IE/IM) of a well-knownmicroviscosity probe, 1,3-bis(1-pyrenyl)propane (BPP), is also employedto study the microviscosity of the mixtures as a complementary measurement.The rotational dynamics of C153 show that there are incompact andcompact domains within the heterogeneous structural [bmim][PF6], resulting in fast and slow components of C153 rotationaldynamics. The microviscosity in different structural domains of [bmim][PF6] before and after adding cosolvent TEGDME with differentmole fractions is further investigated by studying the fluorescenceanisotropy decay of probe molecules. The obtained average rotationtime constants show that the microviscosity of [bmim][PF6] is enhanced after mixing with a certain amount of TEGDME, althoughthe bulk viscosity of TEGDME itself is much lower than that of theionic liquid. This unusual behavior of microviscosity enhancementis further proven by the steady state fluorescence measurement withthe microviscosity probe of BPP. The microviscosity enhancement isreasonably demonstrated by the fast time constant of C153 rotationaldynamics and the departure between the experimentally observed andcalculated ratio of IE/IMof BPP, which shows that this effect is most pronouncedat intermediate mole fractions of the [bmim][PF6] and TEGDMEmixtures. The strengthening effects caused by the molecular interactionsbetween TEGDME and structural heterogeneous ionic liquid [bmim][PF6] are proposed to interpret the unusual microviscosity behaviors. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Physical Chemistry B is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 83994432
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Spectroscopic Evidencefor Unusual Microviscosityin Imidazolium Ionic Liquid and Tetraethylene Glycol Dimethyl EtherCosolvent Mixtures.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Li%2C+Boxuan%22">Li, Boxuan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Yingying%22">Wang, Yingying</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Xuefei%22">Wang, Xuefei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Vdovic%2C+Silvije%22">Vdovic, Silvije</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Guo%2C+Qianjin%22">Guo, Qianjin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Xia%2C+Andong%22">Xia, Andong</searchLink><relatesTo>1</relatesTo>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Journal+of+Physical+Chemistry+B%22">Journal of Physical Chemistry B</searchLink>. Nov2012, Vol. 116 Issue 44, p13272-13281. 10p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Viscosity%22">Viscosity</searchLink><br /><searchLink fieldCode="DE" term="%22Imidazoles%22">Imidazoles</searchLink><br /><searchLink fieldCode="DE" term="%22Ionic+liquids%22">Ionic liquids</searchLink><br /><searchLink fieldCode="DE" term="%22Ethylene+glycol%22">Ethylene glycol</searchLink><br /><searchLink fieldCode="DE" term="%22Methyl+ether%22">Methyl ether</searchLink><br /><searchLink fieldCode="DE" term="%22Benzopyrans%22">Benzopyrans</searchLink><br /><searchLink fieldCode="DE" term="%22Emission+spectroscopy%22">Emission spectroscopy</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The rotational dynamics of coumarin 153 (C153) in imidazolium-basedionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) and tetraethylene glycol dimethyl ether (TEGDME) mixturesacross all mole fractions have been investigated to determine thelocal viscosity of the microenvironment surrounding the probe molecules.The excimer-to-monomer fluorescence emission intensity ratio (IE/IM) of a well-knownmicroviscosity probe, 1,3-bis(1-pyrenyl)propane (BPP), is also employedto study the microviscosity of the mixtures as a complementary measurement.The rotational dynamics of C153 show that there are incompact andcompact domains within the heterogeneous structural [bmim][PF6], resulting in fast and slow components of C153 rotationaldynamics. The microviscosity in different structural domains of [bmim][PF6] before and after adding cosolvent TEGDME with differentmole fractions is further investigated by studying the fluorescenceanisotropy decay of probe molecules. The obtained average rotationtime constants show that the microviscosity of [bmim][PF6] is enhanced after mixing with a certain amount of TEGDME, althoughthe bulk viscosity of TEGDME itself is much lower than that of theionic liquid. This unusual behavior of microviscosity enhancementis further proven by the steady state fluorescence measurement withthe microviscosity probe of BPP. The microviscosity enhancement isreasonably demonstrated by the fast time constant of C153 rotationaldynamics and the departure between the experimentally observed andcalculated ratio of IE/IMof BPP, which shows that this effect is most pronouncedat intermediate mole fractions of the [bmim][PF6] and TEGDMEmixtures. The strengthening effects caused by the molecular interactionsbetween TEGDME and structural heterogeneous ionic liquid [bmim][PF6] are proposed to interpret the unusual microviscosity behaviors. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Physical Chemistry B is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=83994432
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1021/jp304914e
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 10
        StartPage: 13272
    Subjects:
      – SubjectFull: Viscosity
        Type: general
      – SubjectFull: Imidazoles
        Type: general
      – SubjectFull: Ionic liquids
        Type: general
      – SubjectFull: Ethylene glycol
        Type: general
      – SubjectFull: Methyl ether
        Type: general
      – SubjectFull: Benzopyrans
        Type: general
      – SubjectFull: Emission spectroscopy
        Type: general
    Titles:
      – TitleFull: Spectroscopic Evidencefor Unusual Microviscosityin Imidazolium Ionic Liquid and Tetraethylene Glycol Dimethyl EtherCosolvent Mixtures.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Li, Boxuan
      – PersonEntity:
          Name:
            NameFull: Wang, Yingying
      – PersonEntity:
          Name:
            NameFull: Wang, Xuefei
      – PersonEntity:
          Name:
            NameFull: Vdovic, Silvije
      – PersonEntity:
          Name:
            NameFull: Guo, Qianjin
      – PersonEntity:
          Name:
            NameFull: Xia, Andong
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 08
              M: 11
              Text: Nov2012
              Type: published
              Y: 2012
          Identifiers:
            – Type: issn-print
              Value: 15206106
          Numbering:
            – Type: volume
              Value: 116
            – Type: issue
              Value: 44
          Titles:
            – TitleFull: Journal of Physical Chemistry B
              Type: main
ResultId 1