HIGHER CHLORONITRII >ES. 
131 
Pentaphosphonitrilic chloride, P 5 N 5 Oli . — This body, carefully purified 
by fractional distillation, as described above, gave on analysis: 
( 'alrulatcil for 
P«N a Cl I0 . 
Found. 
p 
26.75 
12. 11 
61.14 
26.87 
12.05 
61.42 
N 
CI 
P : N : CI = 1 : 0.99 : 2.00. 
Molecular weight. (Solvent, benzene.) 
Grams 
solvent. 
Grams 
substance. 
Elevation 
(degrees). 
Molecular 
weight found. 
Tercentago 
variation from 
theoretical. 
46.49 
46.49 
46.49 
1. 4688 
2. 9439 
4. 4337 
0.137 
.287 
.437 
619 
589 
583 
+ 6.2 
+1.6 
+ -5 
Calculated for P 5 N 6 Clio, 579.8. 
Pentaphosphonitrilic chloride fuses at 40.5°-41°, and boils at 223°- 
224.3° (corrected) at 13 millimeters. Its vapor is without the pronounced 
and characteristic aromatic odor possessed by that of triphosphonitrilic 
chloride. At its melting point it is miscible in all proportions with 
benzene, gasoline, ether, and carbon disulphide, and can not be recrys- 
tallized from any of these solvents; in fact, small fragments liquefy 
instantly in their concentrated vapors. Glacial acetic acid also dis- 
solves it quite readily, and from this solution water throws it out as an 
oil, solidifying at once on touching. It shows a decided tendency to 
mperfusion, especially when not absolutely pure; when left by evapo- 
ating its ether or benzene solution, it may remain liquid for days, but 
solidities at once on touching with a glass rod, usually to a decidedly 
srystalline mass, at other times to a transparent glass. The pure 
ubstance, when fused, slowly solidifies, long, flat crystals shooting out 
hrough the liquid, which are limited only by the size of the vessel, 
I rystalsof 10 centimeters in length being readily obtained. It contracts 
reatly on solidifying. When pure the solidified mass is naturally dry, 
i ut the least contamination with other members of the series causes a 
ortion to remain liquid, which is easily detected by crushiug on a piece 
[f filter paper; this is a very good test of its purity. This tendency 
) superfusion must be borne in mind in separating it by fractional 
I istillation; a nearly pure sample will remain liquid much longer than 
le higher or lower fractions. In ether solution it is perceptibly 
ore easily attacked by water than the preceding chloronitride, but 
i )t water alone is almost without action. 
