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Solution and solid-state light-induced transformations in heterometallic vanadium-ruthenium nitrosyl complex

Abstract : The work is devoted to the preparation and photochemical investigations of the novel binuclear heterometallic complex [Ru(NO)(NO 2) 2 (μ-NO 2)(μ-CH 3 COO)(μ-O)VO(dbbpy)]. CH 3 CN (dbbpy-4,4'-di-tert-butyl-2,2'-bipyridyl), which is obtained with quantitative yield. The structure of the complex is determined by single crystal X-ray diffraction and by DFT calculations. On the one hand, irradiation at 445 nm of an acetonitrile solution of the complex leads to a NO photo-release reaction. The light excitation induces the charge transfer from NO 2 and dbbpy ligands to the antibonding orbitals of ON-Ru-O-V chain, leading to the NO release, which is confirmed by the DFT. The quantum yield of the Ru-NO photo-cleavage is 0.57±0.05%. The products of the photolysis (NO and paramagnetic Ru III complex) are confirmed by the Griess test and EPR-spectroscopy. On the other hand, the irradiation of the complex in the solid phase at 10 K results in the formation of the metastable bond isomer Ru-ON (MS1), which is detected by the infrared spectroscopy. The stretching vibration of the ν(NO) band of MS1 (1750 cm-1) is shifted by 150 cm-1 to lower energy with respect to the ν(NO) band of the ground state GS (1900 cm-1). The population of the MS1 is about 5%. MS1 thermally decays at 120-140 K back to the GS. Hence, this complex represents a bifunctional platform, which can release nitric oxide in solution and reversibly switch the NO ligand coordination in the solid state. It is shown, that the presence of vanadium strongly influences the photochemical properties of ruthenium nitrosyl both in the solid phase and in solution.
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https://hal.univ-lorraine.fr/hal-03081246
Contributor : Dominik Schaniel <>
Submitted on : Friday, December 18, 2020 - 9:52:32 AM
Last modification on : Saturday, December 19, 2020 - 3:29:38 AM

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Iakov Fomenko, Artem Mikhailov, Vasily Vorobyev, Natalia Kuratieva, Gennadiy Kostin, et al.. Solution and solid-state light-induced transformations in heterometallic vanadium-ruthenium nitrosyl complex. Journal of Photochemistry and Photobiology A: Chemistry, Elsevier, 2021, 407, pp.113044. ⟨10.1016/j.jphotochem.2020.113044⟩. ⟨hal-03081246⟩

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