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Photosensitizing properties of Alkynylrhenium(I) complexes [Re(-C C-R)(CO)(3)(N boolean AND N)] (N boolean AND N=2,2 '-bipy, phen) for H-2 production

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2014
Author Oberholzer Miriam, Probst Benjamin, Bernasconi Dominik, Spingler Bernhard, Alberto Roger,
Project Homogeneous photocatalytic water splitting
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Original article (peer-reviewed)

Journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Page(s) 3002 - 3009
Title of proceedings EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
DOI 10.1002/ejic.201402142

Abstract

A series of complexes of the type [fac-Re(X)(CO)3(NN)] (X = –CC–R, NN = 2,2-bipy, 2,2-phen) were synthesized and fully characterized. Their photophysical characteristics make them very convenient photosensitizers (PSs). Upon light irradiation, H2 formation was observed for all alkynyl complexes in the presence of a water-reducing catalyst (WRC) and a sacrificial electron donor. Relative rates of H2 production indicate a dependency upon the diimine ligands rather than upon the nature of the σ-bonded alkynyl derivatives. The coordinated acetylene group induces a redshift of the λmax of the MLCT band in UV/Vis spectroscopy as compared to those of the corresponding halides, nitriles, or cationic ReI complexes, such as [fac-ReX(CO)3(NN)] (X = pyridine, H2O, NN = bipy, phen).
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