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EXAFS, DFT, light-induced nucleobase binding, and cytotoxicity of the photoactive complex cis-[Ru(bpy)2(CO)Cl]+

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Salassa, Luca, Ruiu, Tiziana, Garino, Claudio, Pizarro, Ana M., Bardelli, Fabrizio, Gianolio, Diego, Westendorf, Aron, Bednarski, Patrick J., Lamberti, Carlo, Gobetto, Roberto and Sadler, P. J.. (2010) EXAFS, DFT, light-induced nucleobase binding, and cytotoxicity of the photoactive complex cis-[Ru(bpy)2(CO)Cl]+. Organometallics, Vol.29 (No.4). pp. 6703-6710. ISSN 0276-7333

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Official URL: http://dx.doi.org/10.1021/om100734y

Abstract

The aqueous photochemistry of cis-[Ru(bpy)2(CO)Cl]+ (1) was investigated at 310 K and under visible light (white) irradiation by NMR and ESI-HR-MS. Complex 1 releases a Cl ligand, coordinates a solvent molecule, and forms the complex cis-[Ru(bpy)2(CO)(H2O)]2+ (2). Also, irradiation experiments were performed in the presence of the nucleobase derivatives 9-ethylguanine (9-EtG) and 9-ethyladenine (9-EtA). Formation of Ru-9-EtG adducts was observed after 3 h irradiation by NMR and HR-MS, while only very small amounts of a Ru-9-EtA adduct could be detected by HR-MS. Solution structural data were obtained by X-ray absorption spectroscopy (XAS) for both 1 and 2. EXAFS gave a Ru−Cl distance of 2.416(7) Å for 1 and a Ru−OH2O distance of 2.102(6) Å for 2. DFT and TDDFT were employed to study the photophysical and photochemical properties of 1. Calculations show that dissociative metal-centered states can be related to the light-induced release of a Cl ligand and subsequent coordination of a solvent molecule. The compound showed no antiproliferative activity in three human carcinoma cell lines (lung, bladder, pancreas) under the testing conditions, either with or without irradiation with UV light.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Photochemistry, Ruthenium compounds, Chlorine compounds
Journal or Publication Title:	Organometallics
Publisher:	American Chemical Society
ISSN:	0276-7333
Date:	1 December 2010
Volume:	Vol.29
Number:	No.4
Page Range:	pp. 6703-6710
Identification Number:	10.1021/om100734y
Status:	Peer Reviewed
Access rights to Published version:	Restricted or Subscription Access
Funder:	Seventh Framework Programme (European Commission) (FP7/2007-2013), European Research Council (ERC), Piedmont (Italy), European Synchrotron Radiation Facility (ESRF), Advantage West Midlands (AWM), European Regional Development Fund (ERDF), Birmingham Science City
Grant number:	220281 (PHOTORUACD) (FP7), 247450 (ERC), CH-2948 (ESRF)
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URI:	http://wrap.warwick.ac.uk/id/eprint/36973