o-Tolidine
SIAL/T8533 - ≥95%
Synonym: 3,3′-Dimethylbenzidine; 4,4′-Bianisidine
CAS Number: 119-93-7
Empirical Formula (Hill Notation): C14H16N2
Molecular Weight: 212.29
EC Number: 204-358-0
MDL Number: MFCD00014773
Linear Formula: [-C6H3(CH3)-4-NH2]2
Product Type: Chemical
application(s) | diagnostic assay manufacturing hematology histology |
assay | ≥95% |
form | powder or chunks |
InChI | 1S/C14H16N2/c1-9-7-11(3-5 |
InChI key | NUIURNJTPRWVAP-UHFFFAOYSA |
mp | 128-131 °C (lit.) |
Quality Level | 200 ![]() |
SMILES string | Cc1cc(ccc1N)-c2ccc(N)c(C) |
storage temp. | room temp |
Application: | o-Tolidine has also been used to determine the presence of laccase activity in T. versicolor fungal colonies. |
Application: | Sensitive colorimetric reagent for gold and for free chlorine in water. |
General description: | o-Tolidine is a diacidic dye which is sparingly soluble in water and easily soluble in ether and alcohol. On exposure to chlorine or bromine vapors, it forms an intense blue color. This forms the basis for detection of chlorine, nitrates and hydrogen peroxide in air or water. It turns yellow on reacting with free chlorine. o-Tolidine easily forms acid salts. |
Packaging: | 25, 100 g in glass bottle |
Warning: | May be carcinogenic. |
Symbol | ![]() ![]() ![]() |
Signal word | Danger |
Hazard statements | H302 - H350 - H411 |
Precautionary statements | P202 - P264 - P270 - P273 - P301 + P312 - P308 + P313 |
Hazard Codes | T,N |
Risk Statements | 45-22-51/53 |
Safety Statements | 53-45-61 |
RIDADR | UN 3077 9 / PGIII |
WGK Germany | WGK 3 |
Flash Point(F) | 212.0 °F - closed cup |
Flash Point(C) | 100 °C - closed cup |
Purity | ≥95% |
mp | 128-131 °C (lit.) |
Storage Temp. | room temp |
UNSPSC | 12171500 |