The microenvironmental effect of cyclodextrin on the acid dissociation of some azo dyes in aqueous solutions.
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概要
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The effects of α- and β-cyclodextrins (CD) on the acid dissociations and tautomeric equilibria of sodium 4-(4′-hydroxy-1′-naphthylazo)-1-naphthalenesulfonate (<B>1</B>) and of the conjugate acid (<B>2</B>) of Methyl Orange were spectrophotometrically examined and were compared with the effect of a nonpolar solvent (THF). The apparent p<I>K</I><SUB>a</SUB> values for the dyes decreased with increasing CD concentration. The effect of CD is mainly explained in terms of the hydrophobic interactions between the azo dyes and CD, resulting in a shift in the tautomeric equilibria from less acidic azonium or hydrazone forms to more acidic azo forms of <B>1</B> and <B>2</B> in an aqueous solution.
- 公益社団法人 日本化学会の論文
著者
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Matsui Yoshihisa
Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University
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Moghida Kazuo
Department of Agricultural Chemistry, Shimane University
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