Coufigutation of A(iuotri- and diauiuiiut^^Co' alt Complexes. Q 



111 the coinpouiid (10) three isomers nmy be tlieoretieally 

 produced, but only one is known, wliich is green. 



Among the above ten series of complex salts, the absorption 

 spectra of (1), (2), (5) and ((>) having ah-eady been studied in 

 aqueous sokition,^'^ I have now measured the absorption spectra 

 of the following eight salts : 





( 



(3) [Co ClCHaO)^ (NH3)3] SO, (Violet) 



(4) [Co Cb H,,0 iNHs);,] CI (Green) 



(5) [CoCl2(H,0)2(NH3)JSO,H 



(6) [Co CI (K,0;3 (NH^)^] SO^+H^O 



(7) [Co (H.ß\ (NHs).,] CI, Prepared from [Co (NH3)3 (N03)3]. 



(8) [Co (H^O), (NH3)3] CI3 Prepared from [Co Cb H^O (NH3)3j CI. 



In order to determine whether the coordinated chlorine atoms 

 of these salts dissociate in water or not, I have also measured the 

 conductivities of the following six complex salts : 



[Co CI (H^O), (NH3)J SO,. K,0, [Co CI H^O (NHg),] SO,, 



[Co CI (H,0), (NH3)3] SO,, [Co CI {^H,),] SO,, 



[Co CO3 (NH3),]2SO„ [Co H^O (NH3),], (S0,)3. 



It was found, as the result, that the chlorine atoms (or 

 halogen atoms generally) and the radicals of the strong acids, 

 which coordinate to the central cobalt atom, are ajDt to dissociate, 

 when th^y are dissolved in water and are sometimes in equilibrium 



(1) Y. Shibata, Journ. College of Science, Imp. Univ. Tokyo Vol. XXXVII, Art. 2, 1915. 



