Effect of Spacer Length and Solvent on the Concentration-Driven
Aggregation of Cationic Hydrogen-Bonding Donor Polythiophenes
Version 2 2018-08-15, 21:10
Version 1 2018-06-13, 12:58
Posted on 2018-08-15 - 21:10
Aggregation
of cationic isothiouronium polythiophenes with alkoxy-spacers
of different lengths at the 3-position of the thiophene ring was studied
in solvents of different polarities. Hydrogen-bonding capacity was
assessed by steady-state absorption and fluorescence spectroscopy,
whereas the aggregation in aqueous solutions was studied by electron
paramagnetic resonance spectroscopy, using paramagnetic probes of
different polarities. The two polymers displayed similar features
in respect to conformation, effect of cosolvents on aggregation, unstructured
absorption–fluorescence spectra, Stokes shifts when aggregated,
solvatochromic effect, and self-quenching concentration. However,
these polymers also showed different specific interactions with water,
Stokes shifts in water, effect of the solvent on the extent of dominant
state of the S1 level, and also different inner cavities and hydrophobic–hydrophilic
surface area in aqueous solution aggregates. Water maximized the difference
between the polymers concerning the effect of specific increases in
concentration, whereas the presence of 1,4-dioxane generated almost
identical effects on both polymers.
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Domínguez, S. E.; Cangiotti, M.; Fattori, A.; Ääritalo, T.; Damlin, P.; Ottaviani, M. F.; et al. (2018). Effect of Spacer Length and Solvent on the Concentration-Driven
Aggregation of Cationic Hydrogen-Bonding Donor Polythiophenes. ACS Publications. Collection. https://doi.org/10.1021/acs.langmuir.8b00808
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AUTHORS (7)
SD
S. E. Domínguez
MC
M. Cangiotti
AF
A. Fattori
TA
T. Ääritalo
PD
P. Damlin
MO
M. F. Ottaviani
CK
C. Kvarnström