Mackay, Fiona S., Farrer, Nicola J., Salassa, Luca, Tai, Hui-Chung, Deeth, Robert J., Moggach, Stephen A., Wood, P. A. (Peter A.), Parsons, S. (Simon) and Sadler, P. J.. (2009) Synthesis, characterisation and photochemistry of Pt-IV pyridyl azido acetato complexes. Dalton Transactions (No.13). pp. 2315-2325. ISSN 1477-9226

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Abstract

Pt-II azido complexes[Pt(bpy)(N-3)(2)] (1), [Pt(phen)(N-3)(2)] (2) and trans-[Pt(N-3)(2)(py)(2)] (3) incorporating the bidentate diimine ligands 2,2'-bipyridine (bpy), 1,10-phenanthroline (phen) or the monodentate pyridine (py) respectively, have been synthesised from their chlorido precursors and characterised by X-ray crystallography; complex 3 shows significant deviation from square-planar geometry (N-3-Pt-N-3 angle 146.7 degrees) as a result of steric congestion at the Pt centre. The novel Pt-IV complexes trans, cis-[Pt(bpy)(OAc)(2)(N-3)(2)] (4), trans, cis-[Pt(phen)(OAc)(2)(N-3)(2)] ( 5), trans, trans, trans-[Pt(OAc)(2)(N-3)(2)(py)(2)] (6), were obtained from 1-3 via oxidation with H2O2 in acetic acid followed by reaction of the intermediate with acetic anhydride. Complexes 4-6 exhibit interesting structural and photochemical properties that were studied by X-ray, NMR and UV-vis spectroscopy and TD-DFT (time-dependent density functional theory). These Pt-IV complexes exhibit greater absorption at longer wavelengths (epsilon = 9756 M-1 cm(-1) at 315 nm for 4; epsilon = 796 M-1 cm(-1) at 352 nm for 5; epsilon = 16900 M-1 cm(-1) at 307 nm for 6, in aqueous solution) than previously reported Pt-IV azide complexes, due to the presence of aromatic amines, and 4-6 undergo photoactivation with both UVA (365 nm) and visible green light (514 nm). The UV-vis spectra of complexes 4-6 were calculated using TD-DFT; the nature of the transitions contributing to the UV-vis bands provide insight into the mechanism of production of the observed photoproducts. The UV-vis spectra of 1-3 were also simulated by computational methods and comparison between Pt-II and Pt-IV electronic and structural properties allowed further elucidation of the photochemistry of 4-6.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Photochemistry, Transition metal complexes, Platinum, Palladium, Density functionals, Oxidation-reduction reaction
Journal or Publication Title:	Dalton Transactions
Publisher:	Royal Society of Chemistry
ISSN:	1477-9226
Date:	2009
Number:	No.13
Number of Pages:	11
Page Range:	pp. 2315-2325
Identification Number:	10.1039/b820550g
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Medical Research Council (Great Britain) (MRC), Körber-Stiftung, Engineering and Physical Sciences Research Council (EPSRC), European Union (EU)
Grant number:	G0701062 (MRC), EP/E000945X (EPSRC), IEF 220281 (EU)
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URI:	http://wrap.warwick.ac.uk/id/eprint/28297

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