BILATRIENES. REACTIONS AND PROPERTIES 



117 



absorption in the visible part of the spectrum Hes in the red; the 

 maximum for the vinyl compound lies 10 nifi further toward the 



TABLE IV 



Absorption Spectra of Bilivcrdins 



Absorption maximum 



750 700 650 600 550 500 



WAVELENGTH, m/z 



450 



400 



350 



Fig. 12. Absorption curves of biliverdin and its hydrochloride in methanol. 



infrared than that of the meso compound, as in the porphyrin series. 

 There is also an absorption band in the ultraviolet, which is high if 



bile pigments of bilivioliiioid type (page 161; i)age 254, curve 4). This also holds 

 for Fischer's "mesobiliverdin" (page 167). The otdy exception is tlie "blue dehydro- 

 genation product of etiomesobilirubin ' (page 167) of Fischer which shows a true 

 bilatriene curve. 



