
TY  - JOUR
A1  - Lincoln, SF 
A1  - Hounslow, AM 
A1  - Jones, AJ 
T1  - Nuclear magnetic resonance study of ligand exchange on Hexakis(1,1,3,3-tetramethylurea)lutetium(III)
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1982
VL  - 35
IS  - 12
SP  - 2393
EP  - 2398
KW  - 
UR  - https://doi.org/10.1071/CH9822393 
N2  - A 270-MHz lH n.m.r. study shows the rate of 1,1,3,3-tetramethylurea exchange on [Lu{OC(NMe2)2}6]2+ in CD3CN solution to be independent of [OC(NMe2)2]free consistent with the operation of either a dissociative mechanism or an interchange mechanism characterized by an encounter complex stability constant &#8805; 400. For this study  ligand exchange rate = 6kex[Lu{OC(NMe2)2}63+] with kex(298.2 K) = 41.9 ± 2.7 s-l, &#916;H&#8225; = 41.7 ± -0.6 kJmol-1 and &#916;S&#8225; = -74 ± JK-1 mol-l. These data are compared with those for the analogous scandium(III) and yttrium(III) systems and also those for some eight-coordinate trivalent lanthanide systems. The preparations of [LuL6] (ClO4)3, where L = OC(NMe2)2, OCMe(NMe2) and OCMe(Net2), are reported. 
ER  -

