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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1021/la4023129
|2 doi
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|a pubmed24n0766.xml
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|a DE-627
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|a eng
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| 100 |
1 |
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|a Zhang, Yuanwei
|e verfasserin
|4 aut
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| 245 |
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|a Controlled aggregation and enhanced two-photon absorption of a water-soluble squaraine dye with a poly(acrylic acid) template
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|c 2013
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|a Text
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|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 17.03.2014
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|a Date Revised 03.09.2013
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Controlling the aggregation behavior of organic dyes is important for understanding and exploring supramolecular assembly utilizing the specific characteristics of aggregation. Regulating J-aggregation by electrostatic interactions between anionic polyelectrolytes and cationic dyes has gained growing interest. Here, we report the formation of J-aggregates of a water-soluble cationic squaraine dye, 4-(pyridinium-1-yl)butylbenzothiazolium squaraine (SQ), using poly(acrylic acid) sodium salt (PAA-Na) as a template. Electrostatic interactions between the PAA-Na polyelectrolyte and the cationic SQ dye enhanced J-aggregation; the absorbance of the resulting J-band with the polyelectrolyte template was much sharper than the absorbance of the J-aggregate formed using a high concentration of NaCl. Significantly, removal of the polyelectrolyte PPA-Na template by the introduction of calcium ions, which can form stronger ionic binding with carboxylate groups, dissociated J-aggregates, freeing the SQ molecules back to unaggregated or lower aggregate forms. To demonstrate the reversibility of the J-aggregate formation cycle, an in situ experiment was conducted that showed 60% reversibility of the second cycle. In addition, an enhancement by ca. 23 times per repeat unit of the two-photon absorption (2PA) cross section was observed at 920 nm for the polyelectrolyte template-SQ J-aggregate compared to unaggregated or lower aggregate SQ. These results suggest a prominent role of polyelectrolyte templated SQ J-aggregation in the enhancement of 2PA efficiency and provide a means of modulating supramolecular assembly
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|a Journal Article
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1 |
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|a Kim, Bosung
|e verfasserin
|4 aut
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|a Yao, Sheng
|e verfasserin
|4 aut
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|a Bondar, Mykhailo V
|e verfasserin
|4 aut
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| 700 |
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|a Belfield, Kevin D
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 29(2013), 35 vom: 03. Sept., Seite 11005-12
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:29
|g year:2013
|g number:35
|g day:03
|g month:09
|g pages:11005-12
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| 856 |
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|u http://dx.doi.org/10.1021/la4023129
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