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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...
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