Chromophore

Name:
Chromophore
Detailed information:
A chemical grouping that when present in an aromatic compound (the chromogen), gives color to the compound by causing a displacement of, or appearance of, absorbent bands in the visible spectrum. Dyes are sometimes classified on the basis of their chief chromophores, e.g., —NO, nitroso dyes; —NO₂, nitro dyes; —N═N—, azo dyes; etc.