4-(4-Nitrophenyl)azoresorcinol Chemical Properties

Melting point:

195-200 °C (dec.)(lit.)

Boiling point:

402.47°C (rough estimate)

Density 

1.3450 (rough estimate)

refractive index 

1.5700 (estimate)

storage temp. 

Store below +30°C.

form 

Powder

pka

8.05±0.35(Predicted)

color 

Orange-red to red

Odor

Odorless

Water Solubility 

Soluble in dilute sodium hydroxide. Insoluble in water.

Merck 

14,5695

BRN 

674709

Stability:

Stable. Incompatible with strong oxidizing agents, strong bases.

CAS DataBase Reference

74-39-5(CAS DataBase Reference)

EPA Substance Registry System

1,3-Benzenediol, 4-[(4-nitrophenyl)azo]- (74-39-5)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/38

Safety Statements 

26-36

WGK Germany 

3

RTECS 

VH2810000

TSCA 

Yes

HS Code 

29270000

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

4-(4-Nitrophenyl)azoresorcinol Usage And Synthesis

Description

Oxygen violet can be prepared by one-step reaction of p-nitroaniline and 1,3-benzenediol. Azo violet can be used to prepare an azobenzene photochromic liquid crystal compound. Photochromic liquid crystal compounds have both photochromic properties and liquid crystallinity, which has become a research hotspot in the field of information storage. Azobenzene-based liquid crystals are the most interesting photochromic liquid crystal materials in recent years due to their unique photoinduced cis-trans isomerism. Azobenzene compounds undergo reversible cis-trans isomerization under the action of light, which makes them have great potential applications in many aspects such as optical storage, photo-holography and optical information processing.

Chemical Properties

dark red to brown crystalline powder

Uses

It is a derivitized resorcinol dye compound with an absorption maximum of 432 nm. Used as a pH indicator.

Uses

4-(4-Nitrophenyl)azoresorcinol is used for the detection of magnesium with which it yields a bright blue color in alkaline solution and it also used to determine molybdenum with which it forms a red-violet complex: Nikitina, Andrianova, C.A. 75, 136789v (1971).

Definition

ChEBI: An azobenzene in which the phenyl rings are 4-nitro- and 2,4-dihydroxy-substituted respectively.

Biochem/physiol Actions

4-(4-Nitrophenylazo)resorcinol is a pH indicator.

Purification Methods

Crystallise the dye from EtOH. [Beilstein 16 H 181, 16 IV 1266.]

4-(4-Nitrophenyl)azoresorcinol (74-39-5)Related Product Information

• Barium sulfate
• Zinc hydroxide
• Magnesium sulfate
• Barium hydroxide
• Thiourea
• Calcium chloride hexahydrate
• Ethylenediaminetetraacetic acid
• Aluminon
• FERROUS SULFATE
• 4-PHENYLAZOPHENOL
• 4-NITROBENZENE-AZO-ORCINOL
• SUDAN ORANGE G
• 4-(4-Nitrophenyl)azoresorcinol
• Orcinol
• 4-NITROAZOBENZENE TECH. 90
• 4-(4-NITROPHENYLAZO)PHENOL
• 5-OCTADECANOYLOXY-2-(4-NITROPHENYLAZO)PHENOL
• N-hydroxy-4-aminoazobenzene