UV-Visible Spectroscopy in Structure Determination

In addition, structural features that are not directly attached to the chromophore have little effect on the spectrum. Therefore, smaller compounds that contain the same chromophore can be used as models to predict the spectra of larger compounds. As an example, the following two compounds have very similar UV spectra  

Studies using model compounds can be useful in structure determinations. For example, the presence of a 1,4-naphthoquinone chromophore in vitamin K was suggested by the similarity of its UV spectrum to those of simpler compounds such as 2-tert-butyl-1,4-naphthoquinone  

CHAPTER I 5 ULTRAVIOLET-VISIBLE SPECTROSCOPY AND MASS SPECTROMETRY 

Explain how UV spectroscopy could be used to distinguish between these compounds. O O 

Ozone is an extremely reactive chemical. Its reaction with alkenes was discussed in Section 11.11. Although it is considered a pollutant in the lower atmosphere, its presence in the upper atmosphere has beneficial health effects due to its absorption of ultraviolet light. 

---