Abstract
The pH dependence of the ultraviolet absorption spectra of aqueous solutions of cyanuric acid and its chlorinated derivatives is attributed to dissociation leading to four species containing the cyanuric nucleus with net charge 0, 1−, 2−, and 3−. Chlorination of cyanuric acid results in more diffuse spectra because several species of a given net charge may exist. At pH 14 the spectra of these solutions are essentially identical regardless of degree of chlorination and the principal organic ion present presumably is the triply charged cyanurate. The value of p K 3 of cyanuric acid is estimated from spectral changes to be about 13. The assignments of electronic transitions and molecular structure are discussed.
Published Version
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