Azo violet

Azo violet: Azo violet

IUPAC name

4-(4-nitrophenyl)azobenzene-1,3-diol

Other names

azoviolet; Magneson; p-Nitrophenylazoresorcinol; 4-Nitrophenylazoresorcinol

Identifiers

Jmol-3D images Image 1

SMILES

Oc2cc(O)ccc2/N=N/c1ccc(cc1)[N+]([O-])=O

Properties

Molecular formula C₁₂H₉N₃O₄

Appearance dark red to brown crystalline powder

Density 1.45 g/cm³

Solubility in water 1 g/L H₂O; 4 g/L Ethanol

Hazards

Flash point 261.7 °C

Y violet (verify) (what is: Y/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Infobox references

Azo violet is an organic compound with the chemical formula C₁₂H₉N₃O₄. It is used as a dye and a pH indicator. It forms blue colour with magnesium in slightly alkaline medium. This reaction depends on adsorption of the dye on magnesium hydroxide. Ammonium ions reduce sensitivity of reaction.

Any salt or salt solution containing magnesium will give this Violet colouring of solution. However, ammonium compounds such as ammonium chloride or ammonium hydroxide will give a different colour based on amount used. Still, it is used as identification test for magnesium.

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Academic Dictionaries and Encyclopedias

Azo violet

IUPAC name 4-(4-nitrophenyl)azobenzene-1,3-diol
Other names azoviolet; Magneson; p-Nitrophenylazoresorcinol; 4-Nitrophenylazoresorcinol
Identifiers
Jmol-3D images	Image 1
SMILES Oc2cc(O)ccc2/N=N/c1ccc(cc1)[N+]([O-])=O
Properties
Molecular formula	C₁₂H₉N₃O₄
Appearance	dark red to brown crystalline powder
Density	1.45 g/cm³
Solubility in water	1 g/L H₂O; 4 g/L Ethanol
Hazards
Flash point	261.7 °C
Y violet (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references