250 



c-axis shows in convergent polarised light the axial image character- 

 istic of uniaxial crystals loithout circular polarisation. The character 

 of the birefringence is negative. 



^ 7. 



Rotation-Dispersion of Laevogyrate Tri-etliylenediamine-Rliodium- 



Bromide. 



The solution contained 7,310 grams of the anhydrous salt in 100 grams of 

 the solution. The length of the tube applied was 20 cm. 



o Wave-length 

 in Angstrom- Units : 



i Specific Rotation [x] 

 in Degrees: 



Molecular rotation [M] 

 in Degrees: 



6780 

 6640 

 6520 

 6380 

 6260 

 6140 

 6030 

 5890 

 7500 

 5510 

 5340 

 5180 

 5100 

 4860 

 4710 

 4310 

 4150 



46,66 

 48,0 

 49,66 

 ■ 53,08 

 • 56,57 

 59,0 

 62,66 

 66,1 

 71,07 

 76,40 

 81,33 

 85,30 

 87,62 

 91,93 

 94,60 

 97,20 

 97,34 



— 2440 



— 2510 



— 2597 



— 2776 



— 2960 



— 3086 



— 3277 

 -3457 



— 3717 



— 3996 



— 4253 



— 4461 



— 4583 

 -4808 



— 4947 



— 5083 



— 5091 



^ 8. RaCEMIC TRl-ETHYLENEDIAMINE-RUOmUM-IODIDE. 



\Rho{Ei7ie),\I,-\-lH,0. 



Very small, colourless, strongly refracting and well-developed 

 crystals, which are completely isomorphous with the corresponding 

 cobalti-S3i\t '). In the last case, however, the symbol jlllj was 



1) F. M. Jaegeh, Proceed. 18. 62- (1915). 



