Abstract
According to the data of 1H NMR spectroscopy, trans-hydroxochloro complexes containing from two to four pyridine molecules in the internal sphere are formed on the heating of a dilute aqueous solution of K2[Ru(NO)Cl5] with pyridine. The evaporation of the reaction solution with concentrated hydrochloric acid gives fac-[Ru(NO)(Py)2Cl3] (I) in a yield of ~90%. The structures of two crystalline modifications of this complex are determined by X-ray diffraction analysis (CIF files ССDС nos. 1452208 (Ia) and 1452207 (Ib)). IR spectroscopy shows that the irradiation of complex I (λ ~ 450 nm, T = 80 K) results in photoisomerization with the formation of the metastable state MS1 in which the nitroso group is coordinated by the oxygen atom. The activation parameters of the photoisomerization are determined from the data of differential scanning calorimetry (DSC). Compound trans-[Ru(NO)Py4(OH)]Cl2 ∙ H2O is isolated in a yield of ~70% on reflux of complex I with a pyridine excess in an aqueous solution, and the presence of molecules of water of crystallization in this compound is confirmed by thermal gravimetry (TG) and IR spectroscopy.
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Original Russian Text © A.N. Makhinya, M.A. Il’in, R.D. Yamaletdinov, I.A. Baidina, S.V. Tkachev, A.P. Zubareva, I.V. Korol’kov, D.A. Piryazev, 2016, published in Koordinatsionnaya Khimiya, 2016, Vol. 42, No. 12, pp. 741–746.
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Makhinya, A.N., Il’in, M.A., Yamaletdinov, R.D. et al. Synthesis, some properties, and crystalline modifications of fac-[Ru(NO)(Py)2Cl3]. Russ J Coord Chem 42, 768–774 (2016). https://doi.org/10.1134/S1070328416120046
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DOI: https://doi.org/10.1134/S1070328416120046