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Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
Published on: July 6, 2016
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Coherent Exciton Delocalization in a Two-State DNA-Templated Dye Aggregate System
Brittany L Cannon1, Donald L Kellis1, Lance K Patten1
1Micron School of Materials Science & Engineering, ‡Department of Chemistry & Biochemistry, and §Department of Electrical & Computer Engineering, Boise State University , Boise, Idaho 83725, United States.
The Journal of Physical Chemistry. A
|August 17, 2017
Summary
DNA-templated dye systems show tunable optical properties. Increasing salt and DNA concentrations induce J-aggregates to H-aggregates, causing a visible color change and demonstrating coherent exciton delocalization.
Area of Science:
- Photophysics and spectroscopy
- Supramolecular chemistry
- Biomaterials
Background:
- Coherent exciton delocalization in dye aggregates leads to J- and H-aggregate behavior and Davydov splitting.
- Room-temperature coherent exciton delocalization is crucial for artificial light-harvesting, colorimetric detection, and quantum computing.
Purpose of the Study:
- To develop a simple, DNA-templated dye system with tunable optical properties.
- To investigate the formation of J- and H-aggregates and their associated optical phenomena.
Main Methods:
- Utilized DNA duplexes functionalized with Cy5 dyes.
- Manipulated salt and DNA concentrations to control DNA structure (dimer vs. tetramer).
- Analyzed optical properties using absorbance spectroscopy.
Main Results:
- At low concentrations, DNA duplexes formed J-aggregates (Cy5 dimer).
- Increased salt/DNA concentrations promoted branch migration, forming H-aggregates (Cy5 tetramer).
- The H-tetramer exhibited significant Davydov splitting, causing a visible color change from cyan to violet, indicating coherent exciton delocalization.
Conclusions:
- DNA templating provides a versatile platform for controlling dye aggregate formation and optical properties.
- The observed J- to H-aggregate transition and Davydov splitting demonstrate efficient coherent exciton delocalization.
- This system holds potential for applications in light-harvesting and sensing technologies.
