Otto Nikolaus Witt

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Otto Nikolaus Witt

German chemist

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dye
Dye structure and colour
In 1876 German chemist Otto Witt proposed that dyes contained conjugated systems of benzene rings bearing simple unsaturated groups (e.g., ―NO₂, ―N=N―, ―C=O), which he called chromophores, and polar groups (e.g., ―NH ₂, ―OH), which he named auxochromes. These ideas remain valid, although they have been broadened by
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In 1876 German chemist Otto Witt proposed that dyes contained conjugated systems of benzene rings bearing simple unsaturated groups (e.g., ―NO₂, ―N=N―, ―C=O), which he called chromophores, and polar groups (e.g., ―NH ₂, ―OH), which he named auxochromes. These ideas remain valid, although they have been broadened by
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