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Nitric oxide (NO) photo-release in a series of ruthenium–nitrosyl complexes: new experimental insights in the search for a comprehensive mechanism

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Abstract

A series of four ruthenium(II) complexes built from the [Ru(terpy)(bipy)(NO)]3+ core (terpy is 2,2′:6′,2′′-terpyridine and bipy is 2,2′-bipyridine) are investigated. They differ by the presence of zero, one, two, or three 4′-(4-methoxyphenyl) (MP) electron donor substituents introduced at different positions on the pyridine fragments to increase the intramolecular charge transfer capabilities towards the strongly withdrawing nitrosyl (NO) ligand. The UV-visible spectra reflect the presence and position of the MP substituents on the complexes. In the case of species containing the 4′-(MP)-terpy ligand, a low-lying transition is identified as arising from 4′-(MP)-terpy to Ru(NO) intramolecular charge transfer, which is further confirmed by TD-DFT analysis. Irradiation performed at λ = 436 nm on this isolated transition for different complexes leads to quantum yields of NO photo-release equal to 0.002 and 0.011, in a ratio of 6 (instead of 1), which allows concluding non-ambiguously that a single electron transition cannot account for the NO release mechanism.

Graphical abstract: Nitric oxide (NO) photo-release in a series of ruthenium–nitrosyl complexes: new experimental insights in the search for a comprehensive mechanism

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Publication details

The article was received on 03 Aug 2018, accepted on 28 Nov 2018 and first published on 28 Nov 2018


Article type: Paper
DOI: 10.1039/C8NJ03907K
Citation: New J. Chem., 2019, Advance Article
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    Nitric oxide (NO) photo-release in a series of ruthenium–nitrosyl complexes: new experimental insights in the search for a comprehensive mechanism

    M. Roose, M. Tassé, P. G. Lacroix and I. Malfant, New J. Chem., 2019, Advance Article , DOI: 10.1039/C8NJ03907K

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