44 THE ABSORPTION SPECTRA OF SOLUTIONS. 



Uranyl Chloride in Methyl Ester. 



The uranyl bands show quite strongly in the methyl ester solution of the 

 chloride. The bands are as follows: X 4030(gf),X4160(/),X 4280(e), X 4440(d) 

 (this band may be double and thus really represent de instead of simply d as 

 given above), X 4620(c), X 4790(6), and X 4920(a). The a band is very weak, 

 compared with the b band. Beyond the a band towards the red, there is a 

 very weak band which is so weak that it is very difficult to distinguish it from 

 the absorption of the blue-violet band itself. 



Uranyl Chloride in Ethyl Ester. 



B, plate 14, represents the absorption spectrum of a solution of uranyl 

 chloride in ethyl ester. The absorption bands are very strong and are quite 

 sharp. The wave-lengths and general appearance of the bands are practically 

 the same as that of the methyl ester solution previously described. 



Uranyl Chloride in Forma.midk. 



B, plate 15, represents the absorption of a solution of uranyl chloride in 

 formamide. The uranyl bands appear quite strong, especially the long wave- 

 length bands. The three bands in the second strip appear of about equal inten- 

 sity at X 4450, X 4650, and X 4840. The latter band is probably the 6 band. 

 The a band does not appear at all on the spectrogram. 



Uranyl Nitrate in Propyl Alcohol. 



B, plate 21, represents the absorption spectrum of uranyl nitrate in propyl 



alcohol. The absorption bands are quite strong and sharp, and appear as 



follows: XX 3640, 3750, 3850, 3970, 4080, 4190, 4320, 4470, 4640, and 4820. The 



latter band is probably the a band, as it is very much narrower than the band 



at X 4640. 



Uranyl Nitrate in Acetone. 



The photograph of the absorption spectrum of uranyl nitrate in acetone 

 showed only three bands. These bands were quite narrow, but were not as 

 sharp as the chloride bands. They are at X 4510, X 4660, and X 4830. 



Uranyl Nitrate in Methyl Ester. 



The absorption spectra of uranyl nitrate in methyl ester is given in A, 



plate 15. The bands are rather weak, appearing at XX 3900, 4000, 4110, 4220, 



4340, and 4480. 



Uranous Chloride in Propyl Alcohol. 



The absorption spectrum of uranous chloride in propyl alcohol is given in 

 A, plate 18. The absorption bands are all quite strong, especially the uranyl 

 bands. The uranyl bands shown most prominently are those at X 4590 and 

 X 4750, each about 80 Angstrom units wide, and a very wide band at X 4950 

 about 150 Angstrom units wide. Two fine bands appear at about X 5190 and 

 X 5210. These bands are about 10 Angstrom units in width. A band at 



o 



X 5500 is about 120 Angstrom units in width. A group of three narrow bands 

 appears at about X 5720, X 5750, and X 5770. The middle band is the strongest 

 one of the group, and is about 15 Angstrom units wide. Absorption maxima 

 appear at about X 6100, X 6270, and X 6520. This whole region is one of more 

 or less general absorption, due to the above very wide bands. The band at 



