Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 246, Issue -, Pages 16-22Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2012.07.006
Keywords
Ultrafast molecular rotor; Ionic liquid; DNA; Fluorescence; Time-resolved spectroscopy
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Funding
- Indian Science Academy (IASC)
- Indian Science Academy (INSA)
- Indian Science Academy (NASI)
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The interaction of imidazolium based ionic liquids with calf thymus DNA has been investigated using a benzothiazole based ultrafast molecular rotor, Thioflavin-T, as a local reporter. It has been found that the addition of ionic liquid causes large reduction in the emission yield of the DNA bound probe indicating a strong interaction between the ionic liquids and DNA. Detailed studies show that the interaction between ionic liquids and DNA is sufficiently strong to remove the bound probe from the DNA. The excited state lifetime of the DNA bound probe measured by femtosecond fluorescence upconversion technique also corroborate with the above proposition. To understand the nature of the interaction between ionic liquids and DNA, photophysical properties of Thioflavin-T in DNA was investigated in the presence of imidazolium based ionic liquids having alkyl side chain of different lengths in the cationic moiety and the results indicate that apart from electrostatic interaction, the hydrophobicity of ionic liquid also plays a significant role in the ionic liquid-DNA interaction. (C) 2012 Elsevier B.V. All rights reserved.
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