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Proceedings Paper

Excited states in porphyrin-DNA interactions
Author(s): Pierre-Yves Turpin; Laurent Chinsky; Peter Mojzes
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Paper Abstract

Complexes of Cu(TMpy-P4) with natural and synthetic DNAs have been investigated by using resonance Raman spectroscopy with both visible and UV laser excitations. Visible excitations in the Soret or the Q bands of the porphyrin provides important vibrational intensity enhancements from the Cu-porphyrin moiety, while UV excitations favors the Raman intensity enhancements from the DNA moieties of the complexes. In addition, high-power laser excitations in the visible region induces the formation of complexes between the porphyrin in one of its excited states and DNA thymine/uracil residues: this new species is called an exciplex. Here we focus on the structural conditions required for the exciplex formation, and attempts are made to determine the nature of this exciplex. On the other hand, the DNA conformational changes induced by the interaction with the porphyrin in its ground- and/or excited states are explored and discussed.

Paper Details

Date Published: 17 June 1993
PDF: 6 pages
Proc. SPIE 1921, Laser Spectroscopy of Biomolecules, (17 June 1993); doi: 10.1117/12.146142
Show Author Affiliations
Pierre-Yves Turpin, LPCB/CNRS (France)
Laurent Chinsky, LPCB/CNRS (France)
Peter Mojzes, LPCB/CNRS (France)

Published in SPIE Proceedings Vol. 1921:
Laser Spectroscopy of Biomolecules

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