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

Jesper Ekström, Maria Abrahamsson, Carol Olson, Jonas Bergquist, Filiz B. Kaynak, Lars Eriksson, Licheng Sun, Hans Christian Becker, Björn Åkermark, Leif Hammarström, Sascha Ott

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

The first ruthenium-diiron complex [(-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.

Original languageEnglish
Pages (from-to)4599-4606
Number of pages8
JournalDalton Transactions
Issue number38
DOIs
Publication statusPublished - Oct 9 2006

ASJC Scopus subject areas

  • Inorganic Chemistry

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