What is a chromophore?
A chromophore is the part of a molecule responsible for its color.
A chemical group capable of selective light absorption resulting in the coloration of certain organic compounds.
The presence of certain unsaturated functional groups, called chromophores, nearly always results in color.
Common examples include retinal (used in the eye to detect light), various food colorings, fabric dyes (azo compounds), pH indicators, lycopene, β-carotene, and anthocyanins.
Common chromophoric groups include carbonyl (C=O), azo (N=N), nitro and aromatic polyenes.