156 THE SIMPLER NATURAL BASES 



The chloride, C 5 H 12 NC1, forms deliquescent needles, the iodide is 

 non-deliquescent ; m. p. 196. 



The perchlorate, C 5 Hi 2 NClO 4 , forms characteristic aggregates of 

 short prisms, which are scarcely birefringent ; 100 grm. of water at 

 20 dissolve 5764 grm., at 145 4-89 grm. Hence this salt is much less 

 soluble than the corresponding choline salt, but six times as soluble as 

 the perchlorate of choline nitric acid ester, q.v. [Hofmann and Hobold, 

 1911 ; under choline]. 



The acid chromate, C 5 H 12 N . HCrO 4 . H 2 O, forms orange needles 

 from water; m.p. 278 on rapid heating; heated slowly it decomposes 

 explosively at 140-150. In contradistinction to choline chromate it 

 is little soluble in cold water (Cramer [1904, under choline]). 



The picrate, C 5 H 12 N . C 6 H 2 O 7 N 3 , forms long feathery golden yellow 

 needles ; m.p. 263-264 ; soluble in 91 '6 parts of water at 23, more so 

 in hot water, readily in hot alcohol (Gulewitsch [1898, 2]). 



The platinichloride, (C 6 H 12 N) 2 PtCl 6 , forms cubes and octahedra of 

 the regular system; m.p. 196-198 (but according to Nothnagel the 

 melting point is 15-20 higher) ; the salt is anhydrous and at 20*5 dis- 

 solves in 37-6 parts of water (Gulewitsch [1898, 2]). The solubility is 

 considerably less than that of the corresponding choline salt. 



The aurichloride, C 5 H 12 N . AuCl 4 , forms large golden yellow 

 acicular crystals; m.p. 232-238; soluble in 336*5 parts of water at 

 2 1 '5; not very soluble in hot water. 



There are two mercuricfUoridts formed by precipitation with 

 alcoholic HgCl 2 and not readily separated, (a) CjH^NCl . 6HgCl 2 , 

 plates and prisms; m.p. 230-234; is but little soluble in hot water. 

 (Jj) C 6 H 12 NC1 . HgCl 2 , triclinic plates, more readily soluble in water 

 (Gulewitsch [1898,2]). 



