2,6(1H,3H)-Pyridinedione, 5-amino-3-(5-amino-1,6-dihydro-2,6-dioxo-3(2H)-pyridinylidene)-
indigoidine
CAS: 2435-59-8
Molecular Formula: C10H8N4O4
2,6(1H,3H)-Pyridinedione, 5-amino-3-(5-amino-1,6-dihydro-2,6-dioxo-3(2H)-pyridinylidene)- - Names and Identifiers
| Name | indigoidine |
| Synonyms | Indigoidin Indigoidine indigoidine 5,5'-Diamino-Δ3,3'(2H,2'H)-bipyridine-2,2',6,6'(1H,1'H)-tetraone 2,6(1H,3H)-Pyridinedione, 5-amino-3-(5-amino-1,6-dihydro-2,6-dioxo-3(2H)-pyridinylidene)- 5-Amino-3-(5-amino-1,2,3,6-tetrahydro-2,6-dioxopyridin-3-ylidene)-2,6(1H,3H)-pyridinedione |
| CAS | 2435-59-8 |
2,6(1H,3H)-Pyridinedione, 5-amino-3-(5-amino-1,6-dihydro-2,6-dioxo-3(2H)-pyridinylidene)- - Physico-chemical Properties
| Molecular Formula | C10H8N4O4 |
| Molar Mass | 248.19 |
| Density | 1.637±0.06 g/cm3(Predicted) |
| Boling Point | 285.6±40.0 °C(Predicted) |
| pKa | 5.88±0.40(Predicted) |
2,6(1H,3H)-Pyridinedione, 5-amino-3-(5-amino-1,6-dihydro-2,6-dioxo-3(2H)-pyridinylidene)- - Reference Information
| properties | indigo is a blue powder, soluble in hot aniline, almost insoluble in water and ethanol. It is yellow-green in concentrated sulfuric acid, and blue precipitate after dilution; it is indigo red in concentrated nitric acid, and then becomes red and yellow. It is light yellow in the alkaline hydrosulfite reduction solution and colorless in the acidic solution. Indigo is insoluble in water, acid and alkali. To make dye adsorption fabric, indigo white must be reduced first. Indigo white is soluble in lye. It can be used to color animal or plant fibers. After dyeing, it is oxidized in the air to generate indigo, which is attached to the fibers and is blue. Therefore, indigo dye solution must have reducing agent and lye. |
| use | indigo is mainly used for dyeing cotton cloth or cotton yarn. Rural dyeing houses use fermentation to dye earth cloth. Most jeans are made of indigo dyed warp yarn, interwoven with white yarn. The cotton cloth that is not mercerized is called wool blue cloth. It can be continuously dipped by the sulfite method. It can also be dyed with wool and silk. It is used in carpets and handicrafts. Indigo is also used to make food dyes and organic pigments. Both indigo carmine and bromoindigo are derivatives of indigo. |
| Production | Indigo is condensed from aniline and chloroacetic acid in the presence of ferric sulfate to N-phenylglycine iron, and then potassium hydroxide is added for mother liquor Conversion, and then alkali fusion with sodium amide and mixed alkali to generate 3-indoxol, and then air oxidation, filtration, crushing, drying and commercialization to obtain the finished product of commercial dye indigo. |
Last Update：2024-04-09 20:49:11
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