Excited state behaviour of substituted dipyridophenazine Cr(III) complexes in the presence of nucleic acids

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Title: Excited state behaviour of substituted dipyridophenazine Cr(III) complexes in the presence of nucleic acids
Authors: Wojdyla, Michal
Smith, Jayden A.
Vasudevan, Suni
Quinn, Susan J.
Kelly, John M.
Permanent link: http://hdl.handle.net/10197/4321
Date: 2010
Abstract: The photophysics and photochemistry of [Cr(phen)2(dppz)]3+ and its 11,12-substituted derivatives [Cr(phen)2(X2dppz)]3+ {X = Me or F} have been studied in the presence of purine nucleotides or DNA using steady state and time-resolved absorption and luminescence spectroscopy. 5'-Adenosine monophosphate (5'-AMP) shows only a weak interaction with the excited states of each complex. By contrast they are efficiently quenched by 5'-guanosine monophosphate (5'-GMP), consistent with photo-induced electron transfer. Laser flash photolysis spectroscopy in the presence of 5'--GMP suggests that both forward and back electron-transfers are rapid. All complexes also display a strong affinity for DNA and evidence for both static and dynamic quenching mechanisms is provided.
Type of material: Journal Article
Publisher: RSC Publishing
Copyright (published version): 2010, Royal Society of Chemistry
Keywords: dppz ligands;Photophysics;Photochemistry;Nucleic acids
DOI: 10.1039/C0PP00110D
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemistry Research Collection

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