
TY  - JOUR
A1  - Hounslow, AM 
A1  - Lincoln, SF 
A1  - Marshall, PA 
A1  - Williams, EH 
T1  - A proton magnetic resonance study of ligand exchange on Pentakis(N,N-diethylacetamide)dioxouranium(VI)
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1981
VL  - 34
IS  - 12
SP  - 2543
EP  - 2548
KW  - 
UR  - https://doi.org/10.1071/CH9812543 
N2  - 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. 
ER  -

