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@ARTICLE{Inal:201085,
author = {Inal, Sahika and Chiappisi, Leonardo and Kölsch, Jonas D.
and Kraft, Mario and Appavou, Marie-Sousai and Scherf,
Ullrich and Wagner, Manfred and Hansen, Michael Ryan and
Gradzielski, Michael and Laschewsky, André and Neher,
Dieter},
title = {{T}emperature-{R}egulated {F}luorescence and {A}ssociation
of an {O}ligo(ethyleneglycol)methacrylate-{B}ased
{C}opolymer with a {C}onjugated {P}olyelectrolyte—{T}he
{E}ffect of {S}olution {I}onic {S}trength},
journal = {The journal of physical chemistry / B},
volume = {117},
number = {46},
issn = {1520-5207},
address = {Washington, DC},
publisher = {Soc.},
reportid = {FZJ-2015-03395},
pages = {14576 - 14587},
year = {2013},
abstract = {Aqueous mixtures of a dye-labeled non-ionic
thermoresponsive copolymer and a conjugated cationic
polyelectrolyte are shown to exhibit characteristic changes
in fluorescence properties in response to temperature and to
the presence of salts, enabling a double-stimuli
responsiveness. In such mixtures at room temperature, i.e.,
well below the lower critical solution temperature (LCST),
the emission of the dye is strongly quenched due to energy
transfer to the polycation, pointing to supramolecular
interactions between the two macromolecules. Increasing the
concentration of salts weakens the interpolymer
interactions, the extent of which is simultaneously
monitored from the change in the relative emission intensity
of the components. When the mixture is heated above its
LCST, the transfer efficiency is significantly reduced,
signaling a structural reorganization process, however,
surprisingly only if the mixture contains salt ions. To
elucidate the reasons behind such thermo- and ion-sensitive
fluorescence characteristics, we investigate the effect of
salts of alkali chlorides, in particular of NaCl, on the
association behavior of these macromolecules before and
after the polymer phase transition by a combination of
UV–vis, fluorescence, and 1H NMR spectroscopy with light
scattering and small-angle neutron scattering measurements},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106},
pnm = {54G - JCNS (POF2-54G24)},
pid = {G:(DE-HGF)POF2-54G24},
experiment = {EXP:(DE-MLZ)KWS1-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000327557700040},
doi = {10.1021/jp408864s},
url = {https://juser.fz-juelich.de/record/201085},
}