The equivalent conductance of higher tetraalkylammonium perchlorates was measured in hexamethylphosphoric triamide (FIMPA); the values obtained for NH
4,
+ tetraheptylammonium ion (n-Hep
4N
+), tetradecylammonium ion (n-Dec
4N
+), tetradodecylammonium ion (n-Dod
4N
+), trioctylpropylammonium ion (TOPN
+), trimethyldodecylammonium ion (TMDN
+), tetradecyldimethylbenzylammonium ion TDDBN
+ and hexamethylenepiperidinium ion (5N6
+) were 21.2
0, 20.8
0, 21.0
5, , 22.9
2, 20.7
5, 18.0
0, 20.8
0 and 22.7
2 cm
2Ω
-11mol
-1, respectively.
These values together with the data for Me
4N
+, Et
4N
+, n-Pr
4N
+, n-Bu
4N
+ and n-Hex, N
+ in HMPA solution' indicate that Et
4N
+ is the smallest in the effective radius calculated from the Stokes' law and TMDN
+ is the largest in the tetraalkylammonium ions examined. The value for n-Dod, N
+ is much the same with the value for Me
4N
+. The value for 5 N 6
+ is between the value for Me
4N
+ and that for n-Pr
4N
+. The solvation number obtained from the effective radius is 1-2 for NH
4+
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