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Two-Step Photon Absorption Driving the Chemical Reaction in the Model Ruthenium Nitrosyl System [Ru(py)4Cl(NO)](PF6)2·1/2H2O

Abstract : Various systems containing the [ML5NO] molecule, where M = Fe, Ru, ... and L = F, Cl, ..., exhibit switching under continuous light (CW) irradiation between the ground-state nitrosyl (GS), isonitrosyl (MSI), and side-on (MSII) configurations. The metastable populations, however, are often limited to a few percent. The [Ru(py)4Cl(NO)](PF6)2·(1)/2H2O system is thus a remarkable model compound as the GS to MSI transformation is nearly complete in a single crystal. A predominant two-step photon absorption process during GS to MSI switching under blue light is revealed by visible absorption spectroscopy, although a low concentration of the transient species hinders the determination of this process by the structural signature. During the depopulation of MSI, both two-step and direct processes are evidenced under red CW irradiation. Different intermediate visible spectra revealing transient species during GS to MSI and the reverse photochemical processes are discussed in relation to MSII properties.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01301351
Contributor : Laurent Jonchère <>
Submitted on : Tuesday, April 12, 2016 - 10:39:02 AM
Last modification on : Wednesday, September 23, 2020 - 6:06:51 PM

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Liya Khadeeva, Wawrzyniec Kaszub, Maciej Lorenc, Isabelle Malfant, Marylise Buron-Le Cointe. Two-Step Photon Absorption Driving the Chemical Reaction in the Model Ruthenium Nitrosyl System [Ru(py)4Cl(NO)](PF6)2·1/2H2O. Inorganic Chemistry, American Chemical Society, 2016, 55 (9), pp.4117-4123. ⟨10.1021/acs.inorgchem.5b02572⟩. ⟨hal-01301351⟩

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