Conclusions
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1.
The protonation of trinuclear osmium clusters of the type Os3(μ-H) (μ-L) (CO)10 in CF3COOH-CH2Cl2 mixtures was studied by PMR and EAS spectroscopy. Equilibrium constants for these protonation reactions were determined and revealed that, relative to its dependence on the nature of the ligand L, the basicity of the clusters increases in the order: OPh< SPh=NHPh << 2-NC5H4.
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2.
The protonation reactions of the clusters Os3(μ-H)(μ-L)(CO)10 proceed at slow rates, due to the significant structural changes which occur in the clusters upon addition of a hydride ligand to an Os-Os bond.
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3.
Addition of a proton in the form of a bridging hydride ligand to clusters of the type Os3(μ-H)(μ-L)(CO)10 leads to a hypsochromic shift of the low-frequency band in the EAS.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2064–2069, September, 1987.
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Korniets, E.D., Kedrova, L.K. & Maksimov, N.G. Effect of bridging ligands on the basicity of trigonal osmium clusters. Russ Chem Bull 36, 1914–1919 (1987). https://doi.org/10.1007/BF00958345
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DOI: https://doi.org/10.1007/BF00958345