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- W2024807898 abstract "Pentakis(N-methylacetamide)dioxouranium(VI) ion, [UO2(nma)5]2+, is shown to be the predominant species in solutions of [UO2]2+ and nma in CD2Cl2 or CD3CN. The virtual constancy of the rate of nma exchange on [UO2(nma)5]2+ over a 56.9-fold range of free-nma concentration in CD3CN is interpreted in terms of a dissociative mechanism. A typical set of kinetic data for this process is kex(273 K)= 336 ± 16 s–1, ΔH‡= 54.4 ± 0.6 kJ mol–1, and ΔS‡= 3.3 ± 2.3 J K–1 mol–1 for a solution in which [UO2(nma)52+], [nma], and [CD3CN] are 0.162 4, 0.661 3, and 15.92 mol dm–3 respectively. In CD2Cl2 higher values are observed for ΔH‡ and ΔS‡, but both data sets lie on an isokinetic plot of ΔH‡ against ΔS‡ for [UO2L5]2+ systems for which the rate of exchange of L is independent of [L]. The significance of this isokinetic relationship is discussed." @default.
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- W2024807898 date "1979-01-01" @default.
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- W2024807898 title "Proton nuclear magnetic resonance study of ligand exchange on the pentakis(N-methylacetamide)dioxouranium(VI) ion" @default.
- W2024807898 doi "https://doi.org/10.1039/dt9790001220" @default.
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