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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1021/la203317t
|2 doi
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|a eng
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|a Kumar, Vinod
|e verfasserin
|4 aut
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|a Contrasting behavior of classical salts versus ionic liquids toward aqueous phase J-aggregate dissociation of a cyanine dye
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|c 2011
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|a Text
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|a ƒaComputermedien
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|a Date Completed 16.02.2012
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|a Date Revised 25.10.2011
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The effect of addition of ionic liquids (ILs) on the aggregation behavior of a cyanine dye, 5,5',6,6'-tetrachloro-1,1'-diethyl-3,3'-di(4-sulfobutyl)-benzimidazolocarbocyanine (TDBC), was investigated. In basic aqueous buffer solutions (pH ≥ 10), TDBC preferably exists in its J-aggregated form. Addition of hydrophilic ILs > 5 wt % is observed to disrupt the TDBC J-aggregates, converting them to monomer form most likely because of the interaction between bulky IL cation and the J-aggregates in a time-dependent fashion. This is evidenced by the observed increase in monomer band absorbance at the expense of the absorbance band due to J-aggregates over time. Inorganic salts at similar molar concentrations do not cause this phenomenon but instead induce TDBC precipitation. At low concentrations (<5 wt %), the added IL acts similarly to the inorganic salts, reducing the overall absorbance of TDBC in the solution most likely due to cation exchange causing TDBC precipitation. Addition of a molecular solvent, ethanol, at 15 wt % results in an initial increase in monomer absorbance, albeit to a much lesser extent than for the corresponding molar fraction of IL, which then decreases over time with recovery of J-aggregate absorbance--quite opposite the time-dependent behavior seen for TDBC in PB at pH 12.0 with >5 wt % IL. The unique and dual behavior of ILs as an additive toward affecting cyanine dye aggregation is demonstrated
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|a Journal Article
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|a Baker, Gary A
|e verfasserin
|4 aut
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|a Pandey, Shubha
|e verfasserin
|4 aut
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|a Baker, Sheila N
|e verfasserin
|4 aut
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|a Pandey, Siddharth
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 27(2011), 21 vom: 01. Nov., Seite 12884-90
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|g volume:27
|g year:2011
|g number:21
|g day:01
|g month:11
|g pages:12884-90
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|u http://dx.doi.org/10.1021/la203317t
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