NOTES
F\TIMATED
"C.
0 10
20 25
TABLEI TABLEI1 CONSTANT O F TETRABUTYLAMSOLUBILITY OF SUBSTITUTED AMMONIUMT o n r ~ ~TsU IODIDE IN PENTABORANE VARIOUSSOLVENTS AT 25'
nI'3SUCIATION
MVNIUM
Temp.,
1449
A0
(assumed)
a X 108
138
5.94
155 170 180
5.78 5.63 5.55
K X 10'
7.7 (i . 4 5.3 4.6
K X 10' (in acetone)e
8.5 7.7 6.8 6.1
The equilibrium constant is only slightly less in pentaborane than in acetone, which may indicate that the interaction between the solvent and the ions (in the ion pairs) is about the same in the two solvents (cf., ref. 4). The value of "a" required to give a straight line a t 25" is the same as that found by Fuoss and I
