Abstract
AbstractIn the case of a large number of vicinally substituted azo dyes derived from 1‐aminonaphthalenedisulphonic acid‐4,8, and ‐6,8, and from 1‐hydroxynaphthalene‐sulphonic acid‐4, it was shown that in the great majority of cases this substitution is accompanied by an often considerable hypsochromic effect. This configuration is not favourable for a coplanar position of benzene ring and azo group and therefore impedes the mesomerism.In the dye p‐nitrobenzene‐azo‐(dimethyl)‐o‐toluidine there is also steric hindrance of the coplanar position of amino group and benzene ring and here also a negative shift of the edge of the absorption band occurs compared with the dye p‐nitrobenzene‐azo‐(dimethyl)‐aniline.
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