JOUBNAL OF THE COLLEuK OF SCIKNCK, TOKYn IMTEKIAL UNIVERSITY. 



VOL XLI., ART. 2. 



Mesotomisation of Diamniine=dinitro=oxalo=cobalt Complex and 



Determination of the Configurations of this Complex 



and of Diammine=tetranitro=cobalt Complex. 



by 



Yuji SHI BATA, Hi'i'ihiiluilaifihi. 



and 



Toshio MARUKI, Fii'jakiushi. •'( 

 Chemical Laboratory, Science College, Tokyo Imperial University. 



In a recent communication [Yuji Sbibata, Recherches sur 

 les spectres d\ibsorption des amrnlnes- complexes métalliques I. 

 Spectres d^absorption des solutions aqueuses des ammines- complexes 

 cobaltiques ; Journ. Coll. Seien. Imp. Univ. Tokio, vol. XXXVII, 

 Art. 2, 1915.] one of the authors discussed the relation between 

 the constructions of various cobalt ammine complexes and the 

 absorption spectra of their aqueous solutions. 



Among those studied, some nitrammine cobalt complexes 

 were also included, and it was found that their absorption spectra 

 are strongly influenced by the difference of the space positions of 

 nitro-groups in the complex ions. Thus, if at least two nitro- 

 groups occupy the furthest corners of a regular octahedron, which 

 is considered to represent the space model of such metal-ammine 

 complexes, three distinct bands appears in their absorption spectra, 

 the absorption maxima existing respectively at about 2000, 3000 

 and 4000 of frequencies. Another group of nitrammine cobalt 

 complexes, which have their nitro-groups only in the adjacent 

 positions, shows merely two absorption bands and lacks the one 

 in the most refrangil)le region of the spectrum. 



