Photoinduced Electron Transfer in DNA Monolayers

Fast photoinduced electron transfer through DNA intercalation.

We report evidence for fast photoinduced electron transfer mediated by the DNA helix that requires metal complexes that are avid intercalators of DNA. Here the donor bis(phenanthroline)(dipyridophenazine)ruthenium(II) [Ru(phen)2dppz2+] and acceptor bis(9,10-phenanthrenequinone diimine)(phenanthroline)rhodium(III) [Rh(phi)2phen3+] intercalate into DNA with Kb > 10(6) M-1. Luminescence quenching ...

Nonequilibrium photoinduced electron transfer

Photoinduced electron transfer between ruthenium complexes and nucleotides or DNA

The quenching of the luminescence of Ru(TAP)++, Ru(HAT)z(bpyp+ (TAP = 1,4,5$-tetraazaphenanthrene; HAT = 1,4,5,8,9,12-hexaazatphenylene; bpy = 2,2'bipyridyl) and related oxidising complexes by DNA, polynucleotides, and purine nucleotides occurs by reductive electron transfer. Laser flash photolysis provides evidence for the formation of the reduced metal complex and the deprotonated nucleotide ...

Photoinduced electron transfer of zinc porphyrin electrostatically bound to DNA

Cationic zinc porphyrin, ZnTMAP4+, externally binds to calf thymus DNA or polynucleotides through electrostatic interactions in a self-stacked (for DNA or [poly(dA-dT)]2) or unstacked (for [poly(dG-dC)]2) form at low [porphyrin]/[base-pair] ratios. When ZnTMAP4+ in these conjugates was excited in the presence of a cationic electron acceptor, electron transfer (ET) occurred to produce the radica...

Photoinduced Electron Transfer in Ionic Media

Title of Document: PHOTOINDUCED ELECTRON TRANSFER IN IONIC MEDIA Rebecca Cristine Vieira, Doctor of Philosophy, 2008 Directed By: Dr. Daniel E. Falvey, Department of Chemistry and Biochemistry The goal of this research was to explore the use of room temperature ionic liquids (RTILs) and ionic liquids crystals (ILCs) as reaction media for photoinduced electron transfer (PET) processes. Photoindu...