Absorption by DNA single strands of adenine isolated in vacuo: the role of multiple chromophores

The Journal of Chemical Physics
Lisbeth M NielsenSteen Brøndsted Nielsen

Abstract

The degree of electronic coupling between DNA bases is a topic being up for much debate. Here we report on the intrinsic electronic properties of isolated DNA strands in vacuo free of solvent, which is a good starting point for high-level excited states calculations. Action spectra of DNA single strands of adenine reveal sign of exciton coupling between stacked bases from blueshifted absorption bands (~3 nm) relative to that of the dAMP mononucleotide (one adenine base). The bands are blueshifted by about 10 nm compared to those of solvated strands, which is a shift similar to that for the adenine molecule and the dAMP mononucleotide. Desolvation has little effect on the bandwidth, which implies that inhomogenous broadening of the absorption bands in aqueous solution is of minor importance compared to, e.g., conformational disorder. Finally, at high photon energies, internal conversion competes with electron detachment since dissociation of the bare photoexcited ions on the microsecond time scale is measured.

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Citations

Feb 22, 2013·The Journal of Chemical Physics·Claire BrunetLaurent Nahon
Aug 11, 2016·Physical Chemistry Chemical Physics : PCCP·Zsuzsanna Benda, Péter G Szalay
Apr 30, 2019·Faraday Discussions·Steven DalyValérie Gabelica
Sep 10, 2014·Physical Chemistry Chemical Physics : PCCP·Josephine Abi-Ghanem, Valérie Gabelica
Oct 22, 2013·Physical Chemistry Chemical Physics : PCCP·Sara Øvad PedersenSteen Brøndsted Nielsen
Apr 3, 2013·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Lisbeth Munksgaard NielsenSteen Brøndsted Nielsen
Aug 18, 2012·Physical Chemistry Chemical Physics : PCCP·Marius WankoAngel Rubio
Jun 5, 2014·The Journal of Physical Chemistry Letters·Aleksandar R MilosavljevićAlexandre Giuliani
Jun 27, 2013·The Journal of Physical Chemistry. B·Marco D'AbramoAndrea Amadei
May 10, 2012·The Journal of Physical Chemistry. a·Frédéric RosuPhilippe Dugourd

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Methods Mentioned

BETA
ionic dissociation

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