indigo structural formula

indigo structural formula

Structural formula

Business number 052E
Molecular formula C16H10N2O2
Molecular weight 262.26



Indigo blue,

C.I. 73000,

Vat Blue 1

Numbering system

CAS number:482-89-3

MDL number:MFCD00005722

EINECS number:207-586-9

RTECS number:DU2988400

BRN number:88275

PubChem number:24853742

Physical property data

1. Character: blue powder

2. Density (g/ m3,25/4): 1.01

3. Relative vapor density (g/cm3,air=1): Undetermined

4. Melting point (ºC):300

5. Boiling point (ºC,Normal pressure): Undetermined

6. Boiling point (ºC,5.2kPa): Undetermined

7.Refractive index: Undetermined

8. Flash Point (ºC): Undetermined

9. Specific optical rotation (º): Undetermined

10. Autoignition point or ignition temperature (ºC): Undetermined

11. Vapor pressure (kPa,25ºC): Undetermined

12. Saturated vapor pressure (kPa,60ºC): Undetermined

13. Heat of combustion (KJ/mol): Undetermined

14. Critical temperature (ºC): Undetermined

15. Critical pressure (KPa): Undetermined

16. Oil and water (octanol/Log value of water) partition coefficient: Undetermined

17. Explosion limit (%,V/V): Undetermined

18. Lower explosion limit (%,V/V): Undetermined

19. Solubility: slightly soluble in water

Toxicological data

1 , acute toxicity: oral administration to miceLD50>32gm/kg, no detailed description except the lethal dose;

Mouse transabdominal LD50: 2200mg/kg, no details except lethal dose;

2Microbial OrganismTESTSystem Mutation: BacteriaSalmonella Typhimurium :500nmol/plate;

Ecological data

This substance may be harmful to the environment, and special attention should be paid to water bodies.

Molecular structure data

1 Molar refractive index:72.22

2 Molar volumem3/mol)185.0

3, Isotonic specific volume (90.2K):522.1

4 Surface tensiondyne/cm)63.4

5 Polarizability(10-24cm328.63

Compute chemical data

1. Hydrophobic parameter calculation reference value (XlogP ): 3.7

2. Hydrogen Bonding Number of donors: 2

3. Hydrogen Bonding Number of receptors: 4

4. Rotatable Number of chemical bonds: 0

5. Interchange Number of isomers: 17

6. Topological molecules Polar surface area (TPSA): 58.2

7. Heavy Atom Quantity: 20

8. Surface charge :0

9. Complexity :453

10. Isotope atomic number:0

11. Determine the number of atomic stereocenters:0

12. Uncertain number of atomic stereocenters:0

13. Determine the number of chemical bond stereocenters:1

14. Uncertain number of chemical bond stereocenters:0

15. Number of covalent bond units: 1

Properties and stability

Use and store according to specifications, no decomposition will occur, and avoid contact with oxides

Storage method

Save in a sealed manner and place it in a ventilated and dry place to avoid contact with other oxides.

Synthesis method

(1) Preparation of indigo. Edible indigo is actually disodium indigo disulfonate. Indigo is sulfonated with concentrated sulfuric acid. After the sulfonation is completed, it is diluted with water and then neutralized with soda ash. Finally, sodium chloride is added to salt out, and the finished product is obtained after filtering, washing, and drying.
(2) Preparation of indigo aluminum lake. Aluminum hydroxide is prepared from aluminum salts such as aluminum chloride and aluminum sulfate and alkali such as sodium carbonate, and then added to lemon indigo aqueous solution to precipitate to obtain the product.


is used as a food coloring agent. Our country stipulates that it can be used in red and green silk, with a maximum usage of 0.02g/kg; in fruit juice (flavor) drinks, carbonated drinks, prepared wine, and candies , pastry decorations, dyed canned cherries (for decoration), and green plums, the maximum usage amount is 0.10g/kg; the maximum usage amount in dipping side dishes is 0.01g/kg.

BDMAEE:Bis (2-Dimethylaminoethyl) Ether

CAS NO:3033-62-3

China supplier

For more information, please contact the following email:

BDMAEE Manufacture !