STOKES.] 
TRI- AND TETRAPHOSPHONITRILIC CHLORIDES. 
87 
nitrogen, prepared as above described, gave the following results on 
analysis: 
Calculated for 
P 4 N 4 C1 8 . 
Found. 
1. 
2. 
p 
26.77 
12.11 
61. 12 
26.89 
12.35 
61.17 
27.00 
12.36 
61.28 
N 
CI 
1. P:N:C1 = 1:1.01:1.99. 2. P:N:C1=1: 1.01: 1.99. 
1 and 2 represent different preparations. 
The vapor density, determined by Victor Meyer's method, in dry 
hydrogen at 300°, was : 
Calculated for 
P 4 N 4 C1 8 . 
Found. 
Density 
16.03 
16. 20 ' 
I am indebted to Mr. B. H. Hite, of the Johns Hopkins University, 
for a series of determinations of the molecular weight by the ebulli- 
oscopic method. The following is his statement of the results: 
Solvent: Benzene. Molecular elevation, 26.7. 
Substance (PNCLJ X . 
Grams sol- 
vent. 
Grams sub- 
stance. 
Concentra- 
tion. 
Elevation 
(degrees). 
Molecular 
weight 
found. 
Percentage 
variation 
from 464. 
37. 618 
37. 618 
37. 987 
1.1620 
1.4820 
1.1107 
3.09 
3.94 
2.92 
0.177 
.227 
.167 
466 
463 
467 
+0.4 
t 2 
+ -7 
These results agree well with the quadruple formula. 
The following table gives some of the constants compared with those 
of P 3 N 3 G1 6 . 
P 3 N 3 C1 6 . 
P 4 N 4 C1 8 . 
Specific gravity : ul.98 
62.18 
123. 5° 
328.5 
12.3 
20.9 
Melting point (corrected) 114° 
Boiling point (760 mm. pressure; 
thermometer wholly in vapor), de- ■ 
grees 256. 5 
100 parts ether at 20° dissolve 46. 5 
100 parts benzene at 20° dissolve 57. 4 
a Gladstone. 
bAt 
