An organic compound containing a C=N double bond (imine) with an azo group (N=N), used in dyes, pigments, and photochromic materials that change color with light.
From 'azo-' (N=N bond) + 'methine' (from 'methyl' + '-ine,' relating to C=N bonds). Synthesized in organic chemistry labs in the early 20th century.
Azomethines are the chemistry behind some sunglasses that darken in sunlight and fade indoors—the molecule literally rearranges itself when hit by UV light, making and breaking those critical bonds.
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