Kinetics of J-aggregation of cyanine dyes in the presence of gelatin

The Journal of Physical Chemistry. B
Helmut GörnerTatyana D Slavnova

Abstract

The kinetics of formation of J-aggregates for 3,3'-bis[sulfopropyl]-R-4',5'-dibenzo-9-ethylthiacarbocyanines (R=5-methoxy; R=4,5-dibenzo) and 3,3'-bis[sulfopropyl]-5,5'-diphenyl-9-ethyloxacarbocyanine were studied in aqueous solution in the presence of gelatin at different pH values and at room and elevated temperatures. Addition of gelatin at concentrations of 0.0005-0.05 wt % to solutions of dyes results in the production of J-aggregates in the tens of seconds to tens of minutes range. The rate of J-aggregate formation increases with increasing concentrations of dye and gelatin, correlates with the rate of decay of dimers, and is also dependent on the dye structure, temperature, and pH. The rate of J-aggregation is increased for and decreased for with an increase in temperature. For and, the rate increases with increasing [H+] and reaches the maximum value at pH 3.3-4.3 for 3. The interaction of with gelatin is considered to be a cooperative binding process, and J-aggregation is characterized by the time-dependent rate constant. Sigmoidal- and nonsigmoidal-type kinetic curves of both formation of J-aggregates and decay of the dimers are best fitted with a stretched exponential function.

References

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Mar 28, 2003·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Claire PeyratoutLars Daehne
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Jul 13, 2006·The Journal of Physical Chemistry. a·Tatyana D SlavnovaHelmut Görner

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Citations

Dec 17, 2008·Photochemistry and Photobiology·Yazhou Zhang, Helmut Görner
Apr 28, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Martina VermathenPeter Bigler
Jul 9, 2010·The Journal of Physical Chemistry. B·Helmut GörnerAlexander K Chibisov
Aug 4, 2007·The Journal of Physical Chemistry. B·Tatyana D SlavnovaAlexander K Chibisov

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