Article ID Journal Published Year Pages File Type
177988 Dyes and Pigments 2008 7 Pages PDF
Abstract

Sultams derived from sulforhodamine dyes by reaction with primary amines undergo reversible ring-chain interconversion that is pH-dependent. The apparent pK for the transition has been modulated in the range 4.40–8.04 by variation of the amino substituents at the 3′,6′-positions of the sulforhodamine. Alterations of the substituent on the sulfonamide nitrogen atom had much smaller effects. The pH-dependent kinetics of ring-closure after photolytic opening of the closed form of one of the compounds studied here have been measured over the pH range 6.02–8.51.

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Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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