The ultra-violet absorption spectra of some complex aromatic hydrocarbons—II

Abstract

The results of the study of the absorption spectra of a number of complex aromatic hydrocarbons, some of which are of considerable biological importance, were described in a previous paper (Part I).* The present paper contains results of similar experimental investigations, together with an account of quantitative measurements at low temperatures. For general theoretical relationships, nomenclature, and technique at room temperatures, reference should be made to Part I, the results here described being obtained as before with a “ Spekker ” photometer. The only experimental change is the substitution of a transformer for the induction coil outfit previously employed. Purity of Materials With few exceptions, all of the compounds studied were prepared synthetically in this Institute by methods described in the original memoirs to which reference is made. The specimens employed for spectroscopic purposes were the original highly purified analytical samples or else specimens which had been specially prepared and purified for examination.