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Issue 11, 2017
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Azobenzene-based ruthenium(ii) catalysts for light-controlled hydrogen generation

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Abstract

Eight new ruthenium(II) half-sandwich complexes containing azobenzene-appended pyridine (1), bipyridine (2–5) and phosphine (6 and 7) ligands have been synthesized and fully characterized. UV-vis spectroscopic studies showed that the trans-to-cis photoisomerization was strongly inhibited upon coordination to the metal centre in azopyridine-derived ligands 1 and 2, but it remained efficient in azobenzene-appended bipyridine (3–5) and phosphine (6 and 7) ligands. The complexes were tested as precatalysts for photo-controlled hydrogen generation by hydrolytic decomposition of ammonia-borane (AB). In situ irradiation of the reaction mixtures of compounds [Ru(p-Cym)(6)Cl]Cl and [Ru(p-Cym)(7)Cl]Cl induced a clear change in the catalytic reaction rate, serving as a proof of concept for light-controlled hydrogen generation.

Graphical abstract: Azobenzene-based ruthenium(ii) catalysts for light-controlled hydrogen generation

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Supplementary files

Article information


Submitted
22 Dec 2016
Accepted
15 Feb 2017
First published
15 Feb 2017

Dalton Trans., 2017,46, 3569-3578
Article type
Paper

Azobenzene-based ruthenium(II) catalysts for light-controlled hydrogen generation

A. Telleria, P. W. N. M. van Leeuwen and Z. Freixa, Dalton Trans., 2017, 46, 3569
DOI: 10.1039/C7DT00542C

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