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Aggregation behavior of aqueous tetrakis(4-sulfonatophenyl)porphyrin in the presence of 1-butyl-3-methylimidazolium tetrafluoroborate

Paper ID Volume ID Publish Year Pages File Format Full-Text
28077 44058 2009 9 PDF Available
Title
Aggregation behavior of aqueous tetrakis(4-sulfonatophenyl)porphyrin in the presence of 1-butyl-3-methylimidazolium tetrafluoroborate
Abstract

Due to their unusual properties the role of ionic liquids (ILs) in affecting aqueous aggregation has become a topic of immense interest. Depending on the pH and the ionic strength of the solution many common porphyrins form J-aggregates in the presence of appropriate external additives. Effect of addition of a ‘hydrophilic’ IL, 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) on aqueous aggregation of a common porphyrin, tetrakis(4-sulfonatophenyl)porphyrin (TSPP), is investigated at different pH in the presence of varying concentration of [bmim][BF4] using molecular absorbance and steady-state fluorescence. The kinetics of the interconverting species in the presence of [bmim][BF4] within aqueous TSPP at different pH is also studied. It is observed that the low amount of [bmim][BF4] (ca. 0.221–0.442 M or ca. 4.5–9.0 vol.%) favors the formation of J-aggregates at low solution pH; further increasing [bmim][BF4] concentration leads to the destabilization of J-aggregates due to the deprotonation of TSPP from H4TSPP2− to H2TSPP4−, which, in turn, gets involved in formation of TSPP–[bmim][BF4] complex. J-aggregation at low pH in the presence of [bmim][BF4] is demonstrated to be significantly more efficient as compared to that in the presence of NaBF4. Presence of [bmim][BF4] at low pH facilitates the conversion of monomeric species to the J-aggregates which follows pseudo first-order kinetics with rate constants in agreement with experimental observations. Unique and effective role of IL [bmim][BF4] in modifying aggregation behavior of aqueous TSPP is clearly demonstrated.

Keywords
Porphyrin; Ionic liquid; J-aggregate; Kinetics; Fluorescence; Aggregation
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Aggregation behavior of aqueous tetrakis(4-sulfonatophenyl)porphyrin in the presence of 1-butyl-3-methylimidazolium tetrafluoroborate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 207, Issues 2–3, 25 September 2009, Pages 288–296
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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