p-Dimethylaminobenzalrhodanine sample and bottle
| IUPAC name
| Other names
|Molar mass||264.361 g/mol|
|Melting point||285–288 °C (545–550 °F; 558–561 K) (decomposes)|
|Solubility|| Very soluble in ethyl acetate, formic acid, HCl 37%, methyl acetate, pyridine|
Moderately soluble in acetone, acetonitrile
Very slightly soluble in benzene, chloroform, diethyl ether, ethanol, isopropanol, methanol, toluene, xylene
Insoluble in ammonia 25%, formaldehyde 37%, hexane
|Solubility in 1,4-Dioxane||0.1 g/100 ml (80 °C)|
|Safety data sheet||Sigma-Aldrich|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|150 mg/kg (mouse, intraperitoneal)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
p-Dimethylaminobenzalrhodanine or 5-(4-Dimethylaminobenzylidene)rhodanine is an organic compound with the formula C12H12N2OS2, used as a silver-specific dye in chemistry.
5-(4-Dimethylaminobenzylidene)rhodanine is a dye usd to detect metal ions.
p-Dimethylaminobenzalrhodanine is a fluffy reddish solid, practically insoluble in water, but very soluble 85% formic acid, HCl 37%, pyridine, good solubility in esters like ethyl and methyl acetate, slightly soluble in primary and secondary low-chain alcohols, acetic acid and insoluble in 25% aq. ammonia, formaldehyde 37% and hexane. It has a bulk density of 0.225 g/cm3.
Can be purchased online and from chemical suppliers.
Best to buy it rather than make it yourself.
- Colorimetric indicator for copper, gold, mercury, platinum, palladium and silver ions
- Indicator used in the titration of cyanide solutions
Little is known about this compound's toxicity. It doesn't appear to cause irritation, but will stain.
In closed bottles.