Substance profile
3,3'-Dichlorobenzidine
3,3'-Dichlorobenzidine is needles from alcohol or benzene.
01 · Identification
What 3,3'-Dichlorobenzidine is
3,3'-Dichlorobenzidine is needles from alcohol or benzene. Its molecular formula is C12H10Cl2N2 and its molecular weight is 253.12 g/mol. It boils at 420 °C, melts at 133 °C.
Under the GHS it carries the signal word Danger. It is classed as hazardous Air Pollutants (HAPs).
Other names for 3,3'-Dichlorobenzidine
- 3,3'-dichlorobiphenyl-4,4'-ylenediamine
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H350 | May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H312 | Harmful in contact with skin. |
| H317 | May cause an allergic skin reaction. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P201, P261, P272, P273, P280, P302, P308, P312, P313, P333, P352, P391, P501
03 · Physical and chemical properties
3,3'-Dichlorobenzidine properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 420 °C (788 °F) | NIOSH | |
| 420 °C (788 °F) | at 760 mmHg | CAMEO | |
| 368 °C (694.4 °F) | ICSC | ||
| Melting point | 132.5 °C (270.5 °F) | HSDB | |
| 132.78 °C (271 °F) | NIOSH | ||
| Solubility | Solubility in water: 2-4% at 22 °C and pH 4.6 to pH 8.9 | at 22 °C, Dihydrochloride salt | HSDB |
| Moderately soluble in alcohol; readily soluble in ether | HSDB | ||
| In water, 3.1 mg/L at 25 °C | at 25 °C | HSDB | |
| Autoignition temperature | 350 °C (662 °F) | ICSC |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling 3,3'-Dichlorobenzidine
Storage conditions
Stable under recommended storage conditions.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Strong oxidizing agents
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
A halide- and amine-substituted aromatic compound. Amines are chemical bases. They neutralize acids to form salts plus water. These acid-base reactions are exothermic. The amount of heat that is evolved per mole of amine in a neutralization is largely independent of the strength of the amine as a base. Amines may be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Flammable gaseous hydrogen is generated by amines in combination with strong reducing agents, such as hydrides.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check 3,3'-Dichlorobenzidine in the storage compatibility matrix →