auxochrome

/awk-suh-krohm/US // ˈɔk səˌkroʊm //UK // (ˈɔːksəˌkrəʊm) //

辅色,辅助色,辅助色素,辅助颜色

Definitions

n.名词 noun

1
Chemistry.
- : any radical or group of atoms that intensifies the color of a substance.

The selenium atom in a cyclic compound also acts like an auxochrome.
This brings selenophene more akin to pyrrole than thiophene, but the group -NH- in the molecule of pyrrole is an auxochrome.
In other words, an auxochrome in addition to the chromophore group transforms a colorless chromogen into a colored one.
While phenyldisulphide is colorless, when an auxochrome group is added, such as NH2, the compound is colored.