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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F12%3A10123733%21RIV13-GA0-11310___
rdf:type
n5:Vysledek skos:Concept
dcterms:description
UV/Vis spectroscopic investigation of aqueous solutions of regio-irregular poly(thiophen-3-ylacetic acid) (PTAA) with and without methyl-ester groups in the presence of sodium and lithium ions as counterions is presented. The samples were carefully purified and characterized with respect to molar mass and the amount of -COOH groups present. We examined how the UV/Vis spectra of solution change with aging of PTAA solution, polymer concentration, addition of low molecular weight salt, temperature, and some other parameters. We show that results crucially depend on whether the spectra are taken for freshly prepared or mature solutions. We demonstrate the validity of the Beer-Lambert law for PTANa, PTAA/Na, and PTAA/Li (aged solution), and violation of this law for PTANa/Me (fresh) solutions in water; the latter system is instead found to exhibit an isosbetic point at 402 nm. We prove that UV/Vis spectra of polythiophene derivatives in water depend on the %22age%22 (time after dissolution) of the solution. The inconsistencies among the spectroscopic data found in literature, as also the discrepancies with our own measurements on PTAA-based systems are discussed UV/Vis spectroscopic investigation of aqueous solutions of regio-irregular poly(thiophen-3-ylacetic acid) (PTAA) with and without methyl-ester groups in the presence of sodium and lithium ions as counterions is presented. The samples were carefully purified and characterized with respect to molar mass and the amount of -COOH groups present. We examined how the UV/Vis spectra of solution change with aging of PTAA solution, polymer concentration, addition of low molecular weight salt, temperature, and some other parameters. We show that results crucially depend on whether the spectra are taken for freshly prepared or mature solutions. We demonstrate the validity of the Beer-Lambert law for PTANa, PTAA/Na, and PTAA/Li (aged solution), and violation of this law for PTANa/Me (fresh) solutions in water; the latter system is instead found to exhibit an isosbetic point at 402 nm. We prove that UV/Vis spectra of polythiophene derivatives in water depend on the %22age%22 (time after dissolution) of the solution. The inconsistencies among the spectroscopic data found in literature, as also the discrepancies with our own measurements on PTAA-based systems are discussed
dcterms:title
UV/Vis Study of the Alkali Salts of Poly(thiophen-3-ylacetic acid) in Water UV/Vis Study of the Alkali Salts of Poly(thiophen-3-ylacetic acid) in Water
skos:prefLabel
UV/Vis Study of the Alkali Salts of Poly(thiophen-3-ylacetic acid) in Water UV/Vis Study of the Alkali Salts of Poly(thiophen-3-ylacetic acid) in Water
skos:notation
RIV/00216208:11310/12:10123733!RIV13-GA0-11310___
n5:predkladatel
n10:orjk%3A11310
n3:aktivita
n14:Z n14:S n14:P n14:I
n3:aktivity
I, P(GAP108/12/1143), S, Z(MSM0021620857)
n3:cisloPeriodika
3
n3:dodaniDat
n15:2013
n3:domaciTvurceVysledku
n20:9193707 n20:9635939
n3:druhVysledku
n4:J
n3:duvernostUdaju
n8:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
176766
n3:idVysledku
RIV/00216208:11310/12:10123733
n3:jazykVysledku
n18:eng
n3:klicovaSlova
conformational relaxation; aging; UV/Vis spectroscopy; conformational transition; polythiophenes; Polyelectrolytes
n3:klicoveSlovo
n6:UV%2FVis%20spectroscopy n6:conformational%20relaxation n6:conformational%20transition n6:aging n6:Polyelectrolytes n6:polythiophenes
n3:kodStatuVydavatele
SI - Slovinská republika
n3:kontrolniKodProRIV
[248EAC65049C]
n3:nazevZdroje
Acta Chimica Slovenica
n3:obor
n7:CD
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:projekt
n11:GAP108%2F12%2F1143
n3:rokUplatneniVysledku
n15:2012
n3:svazekPeriodika
59
n3:tvurceVysledku
Bondarev, Dmitrij Vohlídal, Jiří Vlachy, Vojko Hostnik, Gregor Cerar, Janez
n3:wos
000308792600018
n3:zamer
n16:MSM0021620857
s:issn
1318-0207
s:numberOfPages
11
n19:organizacniJednotka
11310