372 



BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



the value 10.3, which was found for its D. C. at 23°, must be 

 regarded as only approximate. With the liquid sample no dis- 

 tinct maximum resonance was obtained. 



Cyanogen (Liquid). — In view of the high dielectric constant 

 obtained for hydrocyanic acid it seemed of special interest to de- 

 termine the D. C. of liquid cyanogen. Prof. Kahlenberg kindly 

 offered to undertake the preparation of this compound with me. 

 We evolved the cyanogen by treating a strong solution of copper 

 sulphate with a concentrated solution of potassium cyanide. 

 The gas was dried by passing it through two large U-tubes filled 

 with fused calcium chloride. It was condensed by means of 

 solid carbonic acid. The D. C. was measured in a sealed cell at 

 23° C. We found the value 2.52, the position for maximum 

 resonance being well defined. 



All the foregoing results are summarized in the following 

 table, in which the abbreviations (1.) and (s.) are used for 

 liquid and solid respectively. 



Table IV. 



Name. 



Cyanogen (1) 



Hydrocyanic acid (1) 



Acetonitrile 



Propionitrile 



Butyronitrile (n) 



Iso-propyl cyanide 



Valeronitrile (n) 



Iso-butyl cyanide 



Capronitrile 



Ethylene cyanide (s) 



Ethylene cyanide (1) 



<* — Naphthonitrile (s) . . . 

 « — Naphthonitrile (1)... 

 "—Naphthonitrile (1)... 

 ^—Naphthonitrile (s)... 

 /?— Naphthonitrile (1)... 

 Mandelic nitrile 



Formula. 



CCNJa 

 HCN 



CH 3 CN 



C 2 H 5 CN 



C 3 H 7 CN 

 (CH 3 )2 CHCN 



C 4 H 6 CN 



(CH 3 >2 CHCH S CN 

 (CH 3 ) 2 CHCHoCHa 



C 2 H 4 (CN) a 



C 2 H 4 (CN> 8 



Cio H,CN 



Ci o H7 CN 



Cio H7CN 



Co H 7 CN 



C 10 H 7 CN 



C 6 H B CHOHCN 



CN 



23 

 21 

 21 

 22 

 21 

 24 

 21 

 22 

 22 

 23 

 60 

 21 

 42 

 70 

 21 

 70 

 23 



D. C. 



2.52 

 95. 

 36.4 

 26.5 

 20.3 

 20.4 

 17.4 

 17.95 

 15 5 

 65.3 

 61.2 



6.3 7 

 17.9 

 16.0 



4.3 

 16.9 

 17.82 



