
%0 Journal Article
%A Hounslow, AM 
%A Lincoln, SF 
%A Marshall, PA 
%A Williams, EH 
%T A proton magnetic resonance study of ligand exchange on Pentakis(N,N-diethylacetamide)dioxouranium(VI)
%J Australian Journal of Chemistry
%D 1981/12/01
%V 34
%N 12
%P 2543-2548
%K 
%R https://doi.org/10.1071/CH9812543
%U https://www.publish.csiro.au/paper/CH9812543 
%X Pentakis(N,N-diethylacetamide)dioxouranium(VI) bisperchlorate, [UO2(AcNEt2)5] has been isolated. Proton N.M.R. spectroscopy shows that, in the presence of excess free ligand, [UO2- AcNEt2)5]2+ is the greatly predominant dioxouranium(V1) species in both CD2Cl2 and CD3CN solutions. The rate of ligand exchange is independent of free ligand concentration as shown by the rate law  exchange rate = 5k1[UO2(AcNEt2)52+]where in CD2Cl2 solution k1(265 K) = 54.8 ± 8.3 s-1, &#916;H.&#8225; = 68.3 ± 1.2 kJ mol-1 and &#916;S&#8225; = 47.1 ± 4.6 JK-1 mol-1. Somewhat different values for these parameters are obtained in CD3CN solution. These data are compared with similar data for other dioxouranium(VI) systems, and mechanistic comparisons are made. 
