Abstract
Optical spectroscopy experiments were used to study the features of cyanine dye 3,3′-dimethyl-9-(2-thienyl)-thiacarbocyanine iodide (L-21) aggregation in binary solutions DMF:Tris–HCl buffer (pH = 8) containing nucleic acids (DNA or RNA). The appearance of absorption and luminescence bands associated with J-aggregates and dimers that are formed within the minor groove of DNA has been observed. The model of L-21 J-aggregate structure is proposed. It has been found that dimers are the building blocks of L-21 J-aggregates. Disorientation in dimers caused by the minor groove curvature is reason of observation of Davydov splitting in absorption spectrum of L-21 J-aggregates. In the solution containing DNA the absorption and luminescence bands of L-21 J-aggregates exhibit the specific properties that allows the dye L-21 to be used as a fluorescent probe for DNA detection.
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Acknowledgment
We gratefully acknowledge Dr. S. S. Lukashov (Institute of Molecular Biology and Genetics of NAS of Ukraine) for providing dye L-21.
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Guralchuk, G.Y., Sorokin, A.V., Katrunov, I.K. et al. Specificity of Cyanine Dye L-21 Aggregation in Solutions with Nucleic Acids. J Fluoresc 17, 370–376 (2007). https://doi.org/10.1007/s10895-007-0201-5
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DOI: https://doi.org/10.1007/s10895-007-0201-5