122 PROCEEDINGS OP THE AMERICAN ACADEMY 



VII. 



CONTRIBUTIONS FROM THE CHEMICAL LABORATORY OF 

 HARVARD COLLEGE. — J. P. Cooke, Director. 



SILICOTETRAFLUORIDES OF CERTAIN BASES. 



* 



By Arthur M. Comey and F. W. Smith. 



Presented November 8, 1887. 



Supplementary to the investigations* made by C. Loring Jackson 

 and one of us on the action of fluoride of silicon on organic bases, we 

 have further tried the action of fluoride of silicon on nitrosodimethyl- 

 aniline, pyridine, cinchonine, and quinine. 



Trinitrosodimethylanilhie disilicotetrafluoride, (C s H 10 N a O 8 ) a (SiF 4 ) 2 . 

 — This compound was formed by passing fluoride of silicon through a 

 solution of the base in benzol. A lemon-yellow precipitate was formed, 

 which was washed thoroughly with benzol and dried at 100°. The 

 following results were obtained from the analysis of this product : 



0.1822 grm. of the substance gave 0.0345 grm. of silicic dioxide and 

 0.0936 grm. of sodic fluoride. 



Trinitrosodimethylaniline disilicotetrafluoride is a bright yellow 

 amorphous powder, which is decomposed by water, with separation 

 of silicic dioxide, and decomposes completely with slight explosion 

 when heated above 150°. 



Dipyridlne silicotetrafluoride, (C 5 H 3 N) 2 SiF 4 . — This substance was 

 prepared by passing fluoride of silicon through a solution of pyri- 

 dine in benzol, whereupon it separates out in the form of a heavy 

 voluminous precipitate, which when washed with benzol and dried, 

 and immediately analyzed, gave the following results : 



* Ante, p. 20. 



