Nano Archive

Self-assembly of polymethine dye molecules in solutions: Kinetic aspects of aggregation

Chibisov, A. K. and Gorner, H and Slavnova, T. D. (2008) Self-assembly of polymethine dye molecules in solutions: Kinetic aspects of aggregation. Nanotechnologies in Russia, Volume 3 (1-2). pp. 19-34.

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The first part of this paper reviews the spectral properties of dimers and the kinetics of dimerization of sulfonated 9-ethylthiacarbocarbocyanine dyes. The nature of two bands observed in the absorption spectrum of dimers, which are related to the splitting of the lowest excited singlet level of dye monomers, is discussed. An approach to the study of kinetics of the fast dimerization reaction is proposed, which is based on the photochemically induced jump in the monomer concentration. The conversion of an encounter complex of monomers into a dimer is considered as a limiting step in the dimerization reaction. The second part of the review considers the spectral properties of J-aggregates and the kinetics of J-aggregation of thia-and oxacarbocyanine dyes under the action of mono-, di-, and trivalent metal ions. The ion pairs formed between dye monomers/dimers and metal ions are considered as reactants in the aggregation process. The kinetics and mechanisms of this process are discussed from the standpoint of autocatalysis. The influence of proteins (gelatin, ribonuclease, lysozyme, trypsin) on the J-aggregation, the kinetics of this process, and the cooperative mechanism of binding dye molecules by proteins are considered. The possibility of controlling J-aggregation by varying the solution pH is discussed.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Quantum phenomena
ID Code:2115
Deposited By:Prof. Alexey Ivanov
Deposited On:19 Dec 2008 13:14
Last Modified:03 Mar 2009 13:29

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