Auxochrome
any radical or group of atoms that intensifies the color of a substance.
Historical Examples
While phenyldisulphide is colorless, when an auxochrome group is added, such as NH2, the compound is colored.
Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives Y-Gwan Chen
The selenium atom in a cyclic compound also acts like an auxochrome.
Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives Y-Gwan Chen
This brings selenophene more akin to pyrrole than thiophene, but the group -NH- in the molecule of pyrrole is an auxochrome.
Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives Y-Gwan Chen
In other words, an auxochrome in addition to the chromophore group transforms a colorless chromogen into a colored one.
Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives Y-Gwan Chen
noun
a group of atoms that can be attached to a chromogen to convert it into a dye
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any radical or group of atoms that intensifies the color of a substance. Historical Examples Notable differences attend the neutralization of the chromophoric and auxochromic groups. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 Various noun a group of atoms that can be attached to a chromogen to convert it into a dye
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noun a diatom cell before its silicaceous cell wall is formed Historical Examples In the figure one valve alone of the auxospore is seen, the opposite valve not being in focus. The Diatomaceae of Philadelphia and Vicinity Charles Sumner Boyer In conjugation, two cells open and secrete a gelatinous mass from which an auxospore is […]
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a mutant organism, especially a microorganism, that has a nutritional requirement not shared by the parent organism. Compare prototroph (def 1). noun a mutant strain of microorganism having nutritional requirements additional to those of the normal organism auxotroph aux·o·troph (ôk’sə-trŏf’, -trōf’) n. A mutated microorganism having nutritional requirements that differ from those of unmutated microorganisms […]
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