Ultraviolet -visible absorption data compounds

We have compared the ultraviolet-visible absorption and emission characteristics of the model compounds (4, 5, 6) with those of the copolymers (1, 2, 3). The comparisons were conducted in methanol solution and in coating of the polymers upon quartz. In order to compare the model compounds (4, 5, 6) with the polymers, as coatings, mixtures of the model compounds (4, 5, 6) in the parent polymer, poly-(5-vinyl-2-methylpyridinium methosulfate), were coated upon quartz plates. The comparative data of the absorption and emission characteristics of the various experimental combinations are summarized in Table I. 

Studies of ultraviolet and visible absorption spectra started long before the study of infrared absorption spectra, and a far larger number of spectral measurements is available. Still, they have not been fully utilized for the identification of organic compounds and the most important reason for this state of affairs is that these data have not been organized from the point of view of the absorbing system, as outlined above. 

Braude and Nachod gave an excellent theoretical treatment of the causes of ultraviolet and visible absorption and presented 16 tables of absorption data for various classes of organic compounds. 

Organometallic compounds commonly exhibit high reactivities compared to the coordination compounds described previously. Their visible and/or ultraviolet absorption spectra are so complicated that the assignments are often difficult. Theoretical calculations, their reactivities, and spectroscopic data suggest the characteristic natures of chem-... 

Potato phenolase and its carbon monoxide compound, according to Kubowitz (1938), presented only the typical protein absorption at 275 m/x, and there were no other specific absorption bands in the near ultraviolet nor in the visible range of the spectrum. No quantitative data were given, but the enzyme at a concentration of 10 mg./ml. was... 

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