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Formation of fluorescent H-aggregates of a cyanine dye in ultrathin film and its effect on energy transfer

Paper ID Volume ID Publish Year Pages File Format Full-Text
25886 43907 2014 8 PDF Available
Title
Formation of fluorescent H-aggregates of a cyanine dye in ultrathin film and its effect on energy transfer
Abstract

•Formation of Langmuir and Langmuir Blodgett (LB) film of a cyanine derivative Oxa18.•Presence of fluorescent H-aggregate of Oxa18 in LB film.•Enhancement of fluorescence from Oxa18 H-aggregated species in presence of Laponite.•Energy transfer occurs from Oxa18 to sRhb both in solution and in ultrathin film.•In presence of Laponite energy transfer occurs from both Oxa18 monomer and H-aggregates to sRhb.

In this communication we report the formation of fluorescent H-aggregates of a cyanine dye 3,3-Dioctadecyloxacarbocyanine perchlorate (Oxa18) in ultrathin film and its effect on energy transfer between Oxa18 and Sulphorhodamine B monosodium salt (sRhb). Surface pressure–area per molecule isotherm revealed that Oxa18 forms stable Langmuir monolayer at air-water interface. Spectroscopic investigation revealed that Oxa18 forms H-aggregate in Langmuir–Blodgett (LB) film which is enhanced in presence of nano clay laponite. Ideally H-aggregate do not fluoresce. However, due to imperfect stacking of Oxa18 molecules in the aggregates, fluorescence occurred from Oxa18 H-aggregates. This H-aggregated band has substantial effect on the enhancement of energy transfer from Oxa18 to sRhb both in solution and in ultrathin film.

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Keywords
Langmuir–Blodgett; Oxacarbocyanine; H-aggregate; Energy transfer
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Formation of fluorescent H-aggregates of a cyanine dye in ultrathin film and its effect on energy transfer
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 293, 1 November 2014, Pages 57–64
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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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
Online Support
Any Questions? feel free to contact us