Absorption, fluorescence, and acid-base equilibria of rhodamines in micellar media of sodium dodecyl sulfate
作者:Elena N. Obukhova、Nikolay O. Mchedlov-Petrossyan、Natalya A. Vodolazkaya、Leonid D. Patsenker、Andrey O. Doroshenko、Andriy I. Marynin、Boris M. Krasovitskii
DOI:10.1016/j.saa.2016.07.002
日期:2017.1
Rhodamine dyes are widely used as molecular probes in different fields of science. The aim of this paper was to ascertain to what extent the structural peculiarities of the compounds influence their absorption, emission, and acid-base properties under unified conditions. The acid-base dissociation (HR+ ⇄ R + H+) of a series of rhodamine dyes was studied in sodium n-dodecylsulfate micellar solutions. In this
罗丹明染料在不同的科学领域中被广泛用作分子探针。本文的目的是确定在统一条件下化合物的结构特点在多大程度上影响其吸收,发射和酸碱性质。在正十二烷基硫酸钠胶束溶液中研究了一系列罗丹明染料的酸碱解离(HR + ⇄R + H +)。在这种介质中,形式R以两性离子R ±存在。在x吨部分中具有不同取代基的十五种若丹明阳离子HR +的表观电离常数的指数在p K a app的范围内变化 = 5.04至5.53。与胶束结合的若丹明的发射对大量水的pH有明显的依赖性,这为将它们用作荧光界面酸碱指示剂提供了可能性。