auxochrome Definition
a group of atoms that, when attached to a chromophore, alters its ability to absorb light and affects the color of the compound.
Using auxochrome: Examples
Take a moment to familiarize yourself with how "auxochrome" can be used in various situations through the following examples!
Example
The auxochrome in the dye molecule is responsible for its color.
Example
The presence of an auxochrome group shifts the absorption spectrum of the chromophore.
Phrases with auxochrome
an auxochrome that increases the electron density of a chromophore, resulting in a shift towards longer wavelengths and a bathochromic shift
Example
The -OH group is a positive auxochrome that shifts the absorption spectrum of the chromophore towards longer wavelengths.
an auxochrome that decreases the electron density of a chromophore, resulting in a shift towards shorter wavelengths and a hypsochromic shift
Example
The -NO2 group is a negative auxochrome that shifts the absorption spectrum of the chromophore towards shorter wavelengths.
Origins of auxochrome
from Greek 'auxein', meaning 'to increase', and 'chroma', meaning 'color'
Summary: auxochrome in Brief
An 'auxochrome' [awk-suh-krohm] is a group of atoms that, when attached to a chromophore, alters its ability to absorb light and affects the color of the compound. The presence of an auxochrome group can result in a shift towards longer or shorter wavelengths, depending on whether it is a positive or negative auxochrome. Examples of auxochromes include -OH and -NO2 groups.
