NDLI: Photoinduced charge separation in pyrenedicarboxamide-linked DNA hairpins

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Photochemical & Photobiological Sciences Vol - 7 Issue - 9

Photochemical & Photobiological Sciences Vol - 7 Issue - 8

Photochemical & Photobiological Sciences Vol - 7 Issue - 7

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Photochemical & Photobiological Sciences Vol - 7 Issue - 2

Photochemical & Photobiological Sciences Vol -6

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Photoinduced charge separation in pyrenedicarboxamide-linked DNA hairpins

Content Provider	Royal Society of Chemistry (RSC)
Author	Wasielewski, Michael R. Fiebig, Torsten Vura-Weis, Josh Lewis, Frederick D. Shafirovich, Vladimir Wang, Qiang Siegmund, Karsten Hariharan, Mahesh Raytchev, Milen Daublain, Pierre
Copyright Year	2008
Abstract	The synthesis and photophysical properties of the dihydroxypropylamide derivative of pyrene-1,6-dicaboxamide, its aniline dyad, and DNA conjugates are reported. The dicarboxamide serves as a hairpin linker for bis(oligonucleotide) conjugates having short base pair stems. The dihydroxypropyl derivative has a large fluorescence quantum yield and long singlet decay time, as determined by fluorescence and time-resolved broad band pump–probe spectroscopy. The aniline dyad undergoes exergonic charge separation with formation of a radical ion pair which decays via charge recombination. The highly characteristic transient absorption spectrum of the pyrene anion radical is used to monitor the dynamics of its formation and decay. The dicarboxamide-linked hairpin conjugates undergo charge separation with adjacent guanine and adenine bases. Charge separation with guanine is accompanied by efficient pyrene fluorescence quenching. In contrast, reversible charge separation with adenine results in multiple exponential fluorescence decay. The energetics and dynamics of charge separation are compared with those of other arenedicarboxamide DNA hairpin linkers.
Starting Page	1501
Ending Page	1508
Page Count	8
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	7
Issue Number	12
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b813995d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Absorption spectroscopy Energetics Spectroscopy Exergonic process Carrier generation and recombination Fluorescence Adenine Ion Dicarboximide fungicides Guanine Pyrene Quantum Aniline DNA Oligonucleotide Base pair
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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