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Investigation of molecular solvents and ionic liquids with a dual probe

  • A dual probe was investigated by UV-Vis, fluorescence, and ESR spectroscopy. It comprises the pyrene chromophore and the paramagnetic 2,2,6,6-tetramethylpiperidinyl-N-oxyl radical that are covalently linked together via an ester bridge. The dual probe was used to investigate molecular solvents of different polarity as well as ionic liquids bearing either imidazolium or pyrrolidinium cations and various anions, such as bis(trifluoromethylsulfonyl)imide, tetrafluoroborate, tris(pentafluoroethyl)trifluorophosphate, or dicyanamide. The dual probe does not show solvatochromism that is typical for some pyrenes. Furthermore, the dual probe is considerable less mobile compared to 2,2,6,6-tetramethylpiperidinyl-N-oxyl (TEMPO) without additional substituent as detected by ESR spectroscopy. This is caused by the bulky pyrenyl substituent bound at the dual probe resulting in a reduced mobility of the dual probe.

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Author details:Veronika StrehmelORCiDGND, Stefan BerdzinskiGND, Peter StrauchGND, Kerstin Hoffmann-Jacobsen, Bernd Strehmel
Title of parent work (English):Zeitschrift für physikalische Chemie : international journal of research in physical chemistry and chemical physics
Publisher:De Gruyter
Place of publishing:Berlin
Publication type:Article
Year of first publication:2014
Completion year:2014
Release date:2017/03/27
Tag:ESR; Fluorescence; Ionic Liquid; Molecular Probe
Number of pages:15
First page:155
Last Page:169
Funding institution:Deutsche Forschungsgemeinschaft [SPP 1191]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Peer review:Referiert