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Ultrafast FRET to Study Spontaneous Micelle-to-Vesicle Transitions in an Aqueous Mixed Surface-Active Ionic-Liquid System

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Title Ultrafast FRET to Study Spontaneous Micelle-to-Vesicle Transitions in an Aqueous Mixed Surface-Active Ionic-Liquid System
 
Creator MANDAL, S
KUCHLYAN, J
BANIK, D
GHOSH, S
BANERJEE, C
KHORWAL, V
SARKAR, N
 
Subject FRET
ionic liquids
micelles
self-assembly
vesicles
RESONANCE ENERGY-TRANSFER
1-BUTYL-3-METHYLIMIDAZOLIUM OCTYL SULFATE
PHOTOINDUCED ELECTRON-TRANSFER
ROTATIONAL-RELAXATION
AGGREGATION BEHAVIOR
FLUORESCENT DYES
FORSTER THEORY
MOLTEN-SALTS
DYNAMICS
MECHANISM
 
Description The spontaneous micelle-to-vesicle transition in an aqueous mixture of two surface-active ionic liquids (SAILs), namely, 1-butyl-3-methylimidazolium n-octylsulfate ([C(4)mim][C8SO4]) and 1-dodecyl-3-methylimidazoium chloride ([C(12)mim]Cl) is described. In addition to detailed structural characterization obtained by using dynamic light scattering, transmission electron microscopy (TEM), and cryogenic TEM techniques, ultrafast fluorescence resonance energy transfer (FRET) from coumarin 153 (C153) as a donor (D) to rhodamine 6G (R6G) as an acceptor (A) is also used to study micelle-vesicle transitions in the present system. Structural transitions of SAIL micelles ([C(4)mim][C8SO4] or [C(12)mim] Cl micelles) to mixed SAIL vesicles resulted in significantly increased D-A distances, and therefore, increased timescale of FRET. In [C(4)mim][C8SO4] micelles, FRET between C153 and R6G occurs on an ultrafast timescale of 3.3 ps, which corresponds to a D-A distance of about 15 angstrom. As [C(4)mim][C8SO4] micelles are transformed into mixed micelles upon the addition of a 0.25 molar fraction of [C(12)mim] Cl, the timescale of FRET increases to 300 ps, which suggests an increase in the D-A distance to 31 angstrom. At a 0.5 molar fraction of [C(12)mim] Cl, unilamellar vesicles are formed in which FRET occurs on multiple timescales of about 250 and 2100 ps, which correspond to D-A distances of 33 and 47 angstrom. Although in micelles and mixed micelles the obtained D-A distances are well correlated with their radius, in vesicles the obtained D-A distance is within the range of the bilayer thickness.
 
Publisher WILEY-V C H VERLAG GMBH
 
Date 2014-12-28T11:58:01Z
2014-12-28T11:58:01Z
2014
 
Type Article
 
Identifier CHEMPHYSCHEM, 15(16)3544-3553
1439-4235
1439-7641
http://dx.doi.org/10.1002/cphc.201402372
http://dspace.library.iitb.ac.in/jspui/handle/100/16418
 
Language English