scholarly journals The effect of structural heterogeneity upon the microviscosity of ionic liquids

2020 ◽  
Vol 11 (24) ◽  
pp. 6121-6133 ◽  
Author(s):  
Ryan Clark ◽  
Mohd A. Nawawi ◽  
Ana Dobre ◽  
David Pugh ◽  
Qingshan Liu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Bulk Viscosity ◽  
Structural Heterogeneity ◽  
Molecular Rotors ◽  
Complex Relationship ◽  
Molecular Rotor ◽  
Time Resolved Fluorescence ◽  
Time Resolved

The behaviour of two molecular rotors have been studied in various ionic liquids. Time resolved fluorescence shows a complex relationship between the bulk viscosity of the ionic liquid and microstructure of solvent around each molecular rotor.

Differences in the behavior of dicationic and monocationic ionic liquids as revealed by time resolved-fluorescence, NMR and fluorescence correlation spectroscopy

2018 ◽  
Vol 20 (11) ◽  
pp. 7844-7856 ◽  
Author(s):  
Debashis Majhi ◽  
Sudipta Seth ◽  
Moloy Sarkar
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Intermolecular Interactions ◽  
Fluorescence Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Fluorescence Correlation ◽  
Structure And Dynamics ◽  
Dicationic Ionic Liquids

Two imidazolium-based dicationic ionic liquids and one monocationic ionic liquid were investigated to understand their intermolecular interactions, structure and dynamics.

Comparison between pyrrolidinium-based and imidazolium-based dicationic ionic liquids: intermolecular interaction, structural organization, and solute dynamics

2021 ◽  
Vol 23 (37) ◽  
pp. 21029-21041
Author(s):  
Amita Mahapatra ◽  
Manjari Chakraborty ◽  
Sahadev Barik ◽  
Moloy Sarkar
Keyword(s):  
Ionic Liquids ◽  
Steady State ◽  
Nmr Spectroscopy ◽  
Intermolecular Interaction ◽  
Structural Organization ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Dicationic Ionic Liquids ◽  
The Difference ◽  
Solute Dynamics

This work investigates the difference in the microscopic behaviour of imidazolium and pyrrolidinium based ILs employing combined steady state and time-resolved fluorescence, EPR and NMR spectroscopy.

Photo-Luminescence Dynamics of Ionic Liquids Composed of the Dicyanoaurate(I) Anion

2019 ◽  
Vol 72 (2) ◽  
pp. 42 ◽  
Author(s):  
Yoshifumi Kimura ◽  
Takamitsu Narita ◽  
Saki Tanaka ◽  
Mitsuhiro Taniguchi ◽  
Kaori Fujii ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Photo Luminescence ◽  
Wavelength Dependence ◽  
Structural Heterogeneity ◽  
Peak Shift ◽  
Peak Position ◽  
Time Profile ◽  
Excitation Wavelength ◽  
Time Resolved ◽  
The Difference

Time-resolved luminescent spectra of ionic liquids of 1-butyl-3-methylimidazolium dicyanoaurate ([C4mim][Au(CN)2]) and N-butyl-N-methylpyrrolidinium dicyanoaurate ([P14][Au(CN)2]) at different excitation wavelengths (310 and 340nm) were measured using a streak camera. Immediately after photoexcitation, an intense luminescence band appeared at ~380nm that rapidly decayed with a time constant of 31 ps for [C4mim][Au(CN)2] and 71 ps for [P14][Au(CN)2]. With the decay of this band, another luminescent band appeared at ~460nm that slowly decayed (88ns for [C4mim][Au(CN)2] and 1.2μs for [P14][Au(CN)2]). The peak position of this second band shifted to a longer wavelength over time for both ionic liquids. The time profile of the peak showed a multi-exponential decay and depended on the excitation wavelength and the cation species. The peak shift is discussed in terms of the aggregation of anions. The excitation wavelength dependence was supposed to reflect the distribution of the larger oligomer in the ground state and the structural heterogeneity of the ionic liquids. The difference as a result of the cation is discussed in relation to the viscosity and the structure of the ionic liquids.

scholarly journals Light and pH-induced Changes in Structure and Accessibility of Transmembrane Helix B and Its Immediate Environment in Channelrhodopsin-2

2016 ◽  
Vol 291 (33) ◽  
pp. 17382-17393 ◽  
Author(s):  
Pierre Volz ◽  
Nils Krause ◽  
Jens Balke ◽  
Constantin Schneider ◽  
Maria Walter ◽  
...  
Keyword(s):  
Open Channel ◽  
Solvent Accessibility ◽  
Transmembrane Helix ◽  
Structural Heterogeneity ◽  
Time Resolved Fluorescence ◽  
Channel State ◽  
Time Resolved ◽  
Cytoplasmic Surface ◽  
Large Conformational Change ◽  
Ph Dependent

A variant of the cation channel channelrhodopsin-2 from Chlamydomonas reinhardtii (CrChR2) was selectively labeled at position Cys-79 at the end of the first cytoplasmic loop and the beginning of transmembrane helix B with the fluorescent dye fluorescein (acetamidofluorescein). We utilized (i) time-resolved fluorescence anisotropy experiments to monitor the structural dynamics at the cytoplasmic surface close to the inner gate in the dark and after illumination in the open channel state and (ii) time-resolved fluorescence quenching experiments to observe the solvent accessibility of helix B at pH 6.0 and 7.4. The light-induced increase in final anisotropy for acetamidofluorescein bound to the channel variant with a prolonged conducting state clearly shows that the formation of the open channel state is associated with a large conformational change at the cytoplasmic surface, consistent with an outward tilt of helix B. Furthermore, results from solute accessibility studies of the cytoplasmic end of helix B suggest a pH-dependent structural heterogeneity that appears below pH 7. At pH 7.4 conformational homogeneity was observed, whereas at pH 6.0 two protein fractions exist, including one in which residue 79 is buried. This inaccessible fraction amounts to 66% in nanodiscs and 82% in micelles. Knowledge about pH-dependent structural heterogeneity may be important for CrChR2 applications in optogenetics.

Fluorescent probe dependence of the solvation dynamics in ionic liquid BmimBF4 and propylene carbonate mixtures: a time-resolved fluorescence and quantum chemistry study

2019 ◽  
Vol 282 ◽  
pp. 39-50 ◽  
Author(s):  
Yevheniia Smortsova ◽  
François-Alexandre Miannay ◽  
Volodymyr Koverga ◽  
Julien Dubois ◽  
Oleg Kalugin ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Quantum Chemistry ◽  
Fluorescent Probe ◽  
Propylene Carbonate ◽  
Solvation Dynamics ◽  
Time Resolved Fluorescence ◽  
Time Resolved

Rotational and Translational Dynamics of Rhodamine 6G in a Pyrrolidinium Ionic Liquid: A Combined Time-Resolved Fluorescence Anisotropy Decay and NMR Study

2012 ◽  
Vol 116 (27) ◽  
pp. 7883-7890 ◽  
Author(s):  
Jianchang Guo ◽  
Kee Sung Han ◽  
Shannon M. Mahurin ◽  
Gary A. Baker ◽  
Patrick C. Hillesheim ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Fluorescence Anisotropy ◽  
Rhodamine 6G ◽  
Time Resolved Fluorescence ◽  
Fluorescence Anisotropy Decay ◽  
Time Resolved ◽  
Nmr Study ◽  
Anisotropy Decay ◽  
Pyrrolidinium Ionic Liquid
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