Issue 38, 2006

Bio-inspired, side-on attachment of a ruthenium photosensitizer to an iron hydrogenase active site model

Abstract

The first ruthenium–diiron complex [(µ-pdt)Fe2(CO)5{PPh2(C6H4CCbpy)}Ru(bpy)2]2+1 (pdt = propyldithiolate, bpy = 2,2′-bipyridine) is described in which the photoactive ruthenium trisbipyridyl unit is linked to a model of the iron hydrogenase active site by a ligand directly attached to one of the iron centers. Electrochemical and photophysical studies show that the light-induced MLCT excited state of the title complex is localized towards the potential diiron acceptor unit. However, the relatively mild potential required for the reduction of the acetylenic bipyridine together with the easily oxidized diiron portion leads to a reductive quenching of the excited state, instead. This process results in a transiently oxidized diiron unit which may explain the surprisingly high light sensitivity of complex 1.

Graphical abstract: Bio-inspired, side-on attachment of a ruthenium photosensitizer to an iron hydrogenase active site model

Supplementary files

Article information

Article type
Paper
Submitted
11 May 2006
Accepted
18 Jul 2006
First published
08 Aug 2006

Dalton Trans., 2006, 4599-4606

Bio-inspired, side-on attachment of a ruthenium photosensitizer to an iron hydrogenase active site model

J. Ekström, M. Abrahamsson, C. Olson, J. Bergquist, F. B. Kaynak, L. Eriksson, L. Sun, H. Becker, B. Åkermark, L. Hammarström and S. Ott, Dalton Trans., 2006, 4599 DOI: 10.1039/B606659C

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