Auxochrome



any radical or group of atoms that intensifies the color of a substance.
Historical Examples

While phenyldisulphide is colorless, when an auxochrome group is added, such as NH2, the compound is colored.
Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives Y-Gwan Chen

The selenium atom in a cyclic compound also acts like an auxochrome.
Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives Y-Gwan Chen

This brings selenophene more akin to pyrrole than thiophene, but the group -NH- in the molecule of pyrrole is an auxochrome.
Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives Y-Gwan Chen

In other words, an auxochrome in addition to the chromophore group transforms a colorless chromogen into a colored one.
Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives Y-Gwan Chen

noun
a group of atoms that can be attached to a chromogen to convert it into a dye

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