Absorption Spectra of Phenothiazines

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Abstract
Phenothiazine derivatives react with concentrated sulfuric acid either alone or in conjunction with other oxidants such as ferric salts to give products with absorption patterns different from those of the original compounds in both the visible and UV regions of the spectrum. This oxidation method was used in the identification and estimation of many phenothiazine drugs by spectrophotometer. The UV absorption spectra of phenothiazine derivatives are reviewed.
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