The influence of chlorine and sulphonate substituents on the visible absorption maxima of some azo dyes
作者:David Greenwood、Michael G. Hutchings、Brian Lamble
DOI:10.1039/p29860001107
日期:——
A total of 110 arylazo dyes have been prepared, based on five benzenoid and heterocyclic coupling components, and containing combinations of chlorine and sulphonate (sulpho) substituents in the diazo components. Their visible absorption maxima have been analysed in order to determine the degree to which chloro and sulpho substituent influences are constant and transferable, both within a series, and
基于五个苯环和杂环偶联组分,总共制备了110种芳基偶氮染料,并且在重氮组分中包含氯和磺酸盐(磺基)取代基的组合。为了确定氯和磺基取代基的影响在系列内以及系列之间的恒定和可转移的程度,已对其可见吸收最大值进行了分析。如果考虑到空间效应,则可加性是相关的。取决于偶联组分的性质,单独的2-磺基可引起非平面性。在严格的加性基础上,2-sulpho-3-chloro组合尤其可导致意想不到的七色变迁。计算机辅助分子建模研究已经阐明了存在的空间相互作用。二邻-取代也引起非平面性和七色效应。有一些证据表明取代基在两个不同的间位取向上是不等价的,尽管MO计算不能重现这种行为。