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4-(4-nitrophenylazo)resorcinol

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Origin: China

Cas No: 74-39-5

Specification: 99%min

Min order Quantity: 1 /kg

Supply Ability: 50 mt/month

Lead time: 7 days for OEM, 3 days for ready goods

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CAS No.: 74-39-5 Formula: C12H9N3O4 Molecular Weight: 259.21800

Description

Azo violet (4-(4-Nitrophenylazo)resorcinol) is an organic compound with the chemical formula C12H9N3O4. It is used commercially as a violet dye and experimentally as a pH indicator, turning blue-purple in the presence of magnesium salt in a slightly alkaline, or basic, environment. Azo violet may also be used to test for the presence of ammonium ions. The color of ammonium chloride or ammonium hydroxide solution will vary depending upon the concentration of azo violet used.
Tautomerization of Azo Violet; Azo Violet Isomerization; Azo violet is synthesized from a diazonium salt coupling reaction, from nitrophenol and resorcinol derivatives. The intense color from which the compound gets its name results from irradiation and subsequent excitation and relaxation of the extended pi electron system across the R-N=N-R’ linked phenols. Absorption of these electrons falls in the visible region of the electromagnetic spectrum. Azo violet’s intense indigo color (λmax 432 nm) approximates Pantone R: 102 G: 15 B: 240.

Basic Info

Chemical Name	4-(4-nitrophenylazo)resorcinol
Synonyms	4-(4-Nitrophenylazo)resorcinol; 1,3-Benzenediol, 4-[(4-nitrophenyl)azo]-;
CAS No.	74-39-5
Molecular Formula	C12H9N3O4
Molecular Weight	259.21800
PSA	111.00000
LogP	3.94460

Properties

Appearance & Physical State	dark red to brown crystalline powder
Density	1.45 g/cm3
Boiling Point	509.2ºC at 760 mmHg
Melting Point	195-200ºC
Refractive Index	1.665
Stability	Stable. Incompatible with strong oxidizing agents, strong bases.

Safety Info

RTECS	VH2810000
Safety Statements	S26-S36
HS Code	2927000090
WGK Germany	3
Risk Statements	R36/38
Hazard Codes	Xi

Synthesis Route

4-Nitroaniline+resorcinol→4-(4-nitrophenylazo)resorcinol
4-Nitrobenzenediazonium chloride+resorcinol→4-(4-nitrophenylazo)resorcinol
benzene-1,2,4-triol+4-nitrophenylhydrazine→4-(4-nitrophenylazo)resorcinol

Precursor

4-Nitroaniline
4-nitrophenylhydrazine
resorcinol
4-Nitrobenzenediazonium chloride

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