Study of picosecond processes of an intercalated dipyridophenazine Cr(III) complex bound to defined sequence DNAs using transient absorption and time-resolved infrared methods

Stephen J. Devereux; Páraic M. Keane; Suni Vasudevan; Igor V. Sazanovich; Michael Towrie; Qian Cao; Xue-Zhong Sun; Michael W. George; Christine J. Cardin; Noel A. P. Kane-Maguire; John M. Kelly; Susan J. Quinn

doi:10.1039/C4DT01989J

Study of picosecond processes of an intercalated dipyridophenazine Cr(iii) complex bound to defined sequence DNAs using transient absorption and time-resolved infrared methods†

Stephen J. Devereux,^a Páraic M. Keane,^bc Suni Vasudevan,^b Igor V. Sazanovich,^d Michael Towrie,^d Qian Cao,^e Xue-Zhong Sun,^e Michael W. George,^e Christine J. Cardin,^c Noel A. P. Kane-Maguire,^f John M. Kelly*^b and Susan J. Quinn*^a

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^a School of Chemistry and Chemical Biology, Centre for Synthesis and Chemical Biology, University College Dublin, Dublin 4, Ireland
E-mail: susan.quinn@ucd.ie

^b School of Chemistry, Trinity College Dublin, Dublin 2, Ireland

^c Department of Chemistry, University of Reading, UK

^d Central Laser Facility, Research Complex at Harwell, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire, UK

^e Department of Chemistry, University of Nottingham, UK

^f Department of Chemistry, Furman University, South Carolina, USA

Abstract

Picosecond transient absorption (TA) and time-resolved infrared (TRIR) measurements of rac-[Cr(phen)₂(dppz)]³⁺ (1) intercalated into double-stranded guanine-containing DNA reveal that the excited state is very rapidly quenched. As no evidence was found for the transient electron transfer products, it is proposed that the back electron transfer reaction must be even faster (<3 ps).

This article is part of the themed collection: Spectroscopy of Inorganic Excited States

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Study of picosecond processes of an intercalated dipyridophenazine Cr(iii) complex bound to defined sequence DNAs using transient absorption and time-resolved infrared methods†

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Study of picosecond processes of an intercalated dipyridophenazine Cr(III) complex bound to defined sequence DNAs using transient absorption and time-resolved infrared methods

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