Picric acid

Piric acid structural formula

Piric acid structural formula

Structural formula

Business number 02BL
Molecular formula C6H5N3O5
Molecular weight 199.12



Numbering system

CAS number:96-91-3

MDL number:MFCD00070534

EINECS number:202-544-6

RTECS number:SJ5800000

BRN number:None

PubChem ID:None

Physical property data

1. Properties: The pure product is red monoclinic crystal

2. Density (g/mL, 20℃): Undetermined

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

4. Melting point (ºC): 169

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

6. Boiling point (ºC, KPa): Not determined

7. Refractive index: Undetermined

8. Flash point (ºC): 210

9. Specific rotation (º): Undetermined

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

11. Vapor pressure (mmHg,ºC): Undetermined

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

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

14. Critical temperature ( ºC): Undetermined

15. Critical pressure (KPa): Undetermined

16. Log value of oil-water (octanol/water) partition coefficient: Undetermined

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

18. Explosion lower limit (%, V/V): Undetermined

19. Solubility: Soluble in water, ethanol and benzene. Slightly soluble in chloroform and ether.

Toxicological data

1. Acute toxicity: rat subcutaneous LDL0: 2100mg/kg; dog intravenous LDL0: 150mg/kg; pigeon peritoneal cavity LDL0: 140mg/kg; pigeon muscle LDL0: 100mg/kg; 2. Mutagenicity: mutant microorganism test: Bacteria – Salmonella typhimurium, 5 μmol/plate;

Ecological data

This substance is harmful to the environment. Do not let this substance enter the environment. Special attention should be paid to the pollution of water bodies.

Molecular structure data

1. Molar refractive index: 45.46

2. Molar volume (cm3/mol): 113.8

3. Isotonic specific volume (90.2K ): 359.0

4. Surface tension (dyne/cm): 99.0

5. Polarizability (10-24cm3): 18.02

Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP): None

2. Number of hydrogen bond donors: 2

3. Number of hydrogen bond acceptors: 6

4. Number of rotatable chemical bonds: 0

5. Number of tautomers: 7

6. Topological molecule polar surface area 138

7. Number of heavy atoms: 14

8. Surface charge: 0

9. Complexity: 247

10. Number of isotope atoms: 0

11. Determine atomsNumber of stereocenters: 0

12. Uncertain number of stereocenters of atoms: 0

13. Determined number of stereocenters of chemical bonds: 0

14. Uncertain number of stereocenters of chemical bonds: 0

15. Number of covalent bond units: 1

Properties and stability

Avoid contact with oxides.

Storage method

Store in a cool, ventilated warehouse. Keep away from fire and heat sources. Protect from direct sunlight. The packaging is sealed. They should be stored separately from oxidants and food chemicals, and avoid mixed storage. Use explosion-proof lighting and ventilation facilities. It is prohibited to use mechanical equipment and tools that are prone to sparks. Suitable materials should be available in the storage area to contain spills.

Synthesis method

It is prepared by partial reduction of 2,4,6-trinitrophenol with sodium hydrosulfide or electrolytic reduction in an alcoholic sulfuric acid solution of vanadium sulfate.


Used in the manufacture of azo dyes, analytical reagents, indicators, etc.