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4-(4-Nitrophenyl)azoresorcinol

4-(4-Nitrophenyl)azoresorcinol Structure
4-(4-Nitrophenyl)azoresorcinol structure
CAS No.
74-39-5
Chemical Name:
4-(4-Nitrophenyl)azoresorcinol
Synonyms
MAGNESON;MagnesonⅠ;MagnesonⅠ;MAGNESON I;AZO VIOLET;MagnesonIGr;MagnesonIiGr;p-diazviolet;MagnesonⅠ, AR;Magneson I AR
CBNumber:
CB0106591
Molecular Formula:
C12H9N3O4
Molecular Weight:
259.22
MDL Number:
MFCD00007310
MOL File:
74-39-5.mol
MSDS File:
SDS
TDS File:
TDS
Last updated:2026-07-31 08:02:38
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4-(4-Nitrophenyl)azoresorcinol 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
Appearance Red, Orange or Red-Orange Powder
Water Solubility Soluble in dilute sodium hydroxide. Insoluble in water.
λmax 432 nm
Merck 14,5695
BRN 674709
Stability Stable. Incompatible with strong oxidizing agents, strong bases.
Major Application diagnostic assay manufacturing
hematology
histology
InChI 1S/C12H9N3O4/c16-10-5-6-11(12(17)7-10)14-13-8-1-3-9(4-2-8)15(18)19/h1-7,16-17H/b14-13+
InChIKey NGPGYVQZGRJHFJ-BUHFOSPRSA-N
SMILES Oc1ccc(\N=N\c2ccc(cc2)[N+]([O-])=O)c(O)c1
CAS DataBase Reference 74-39-5(CAS DataBase Reference)
FDA UNII YND5ZT5BS3
EPA Substance Registry System 1,3-Benzenediol, 4-[(4-nitrophenyl)azo]- (74-39-5)
UNSPSC Code 12352104
NACRES NA.47

SAFETY

Risk and Safety Statements

Symbol(GHS)  Exclamation Mark (GHS07)
GHS07
Signal word  Warning
Hazard statements  H315-H319-H335
Precautionary statements  P261-P280a-P304+P340-P305+P351+P338-P405-P501a
PPE dust mask type N95 (US), Eyeshields, Gloves
Hazard Codes  Xi
Risk Statements  36/38
Safety Statements  26-36
WGK Germany  3
RTECS  VH2810000
TSCA  TSCA listed
HS Code  29270000
Storage Class 11 - Combustible Solids
NFPA 704
1
2 0

4-(4-Nitrophenyl)azoresorcinol price More Price(33)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 114669 4-(4-Nitrophenylazo)resorcinol Dye content 90% 74-39-5 25g $72.5 2026-04-30 Buy
Sigma-Aldrich 8.41713 4-(4-Nitrophenylazo)-resorcinol for synthesis 74-39-5 25G $144 2026-04-30 Buy
Sigma-Aldrich 114669 4-(4-Nitrophenylazo)resorcinol Dye content 90% 74-39-5 100g $236 2026-04-30 Buy
TCI Chemical N0135 Magneson 74-39-5 1g $17 2026-04-30 Buy
TCI Chemical N0135 Magneson 74-39-5 25g $33 2026-04-30 Buy
Product number Packaging Price Buy
114669 25g $72.5 Buy
8.41713 25G $144 Buy
114669 100g $236 Buy
N0135 1g $17 Buy
N0135 25g $33 Buy

4-(4-Nitrophenyl)azoresorcinol Chemical Properties, Uses, Production

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

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).

Uses

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

Definition

ChEBI: 4-(4-nitrophenylazo)resorcinol is an azobenzene in which the phenyl rings are 4-nitro- and 2,4-dihydroxy-substituted respectively. It is a member of resorcinols, a C-nitro compound and a member of azobenzenes.

Biochem/physiol Actions

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

Synthesis

A solution of NaNO2 (1.035 g) in deionized water (15 mL) is slowly added to a solution of p-nitroaniline (2.07 g) in hydrochloric acid (2.5 mol/L, ) 10 mL) in hydrochloric acid (2.5 mol/L, ). The solution is held at 0C for 1 hour under vigorous mechanical stirring. The solution was then washed with ammonia and deionized water until the pH of the filtrate reached 7. The diazonium salt was then washed with ammonia and deionized water until the pH of the filtrate reached 7. The diazonium salt solution is then added to a solution of 1,3-benzenediol (1.65 g) and sodium hydroxide (1.2 g) in deionized water (60 mL) at 0C and held under stirring for 1 hour. 1 hour. The solid precipitate was washed with ammonia and deionized water until the pH of the filtrate reached 7. The resulting precipitate was filtered and the crude product was recrystallized twice with ethanol. The orange-red compound apoxidized violet was obtained in 73.8% yield.

Purification Methods

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

4-(4-Nitrophenyl)azoresorcinol Preparation Products And Raw materials

Raw materials

N-Methyl-4-nitroaniline Resorcinol

Preparation Products

4-(4-Nitrophenyl)azoresorcinol Suppliers

Global Suppliers ( 244)
Supplier Tel Email Country ProdList Advantage
Shanghai Yingxin Laboratory Equipment Co., Ltd. 021-59178156 17002132182 3146474380@qq.com China 9997 58
J & K SCIENTIFIC LTD. 18210857532 18210857532 jkinfo@jkchemical.com China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. 4006356688 18621169109 market03@meryer.com China 40202 62
3B Pharmachem (Wuhan) International Co.,Ltd. 18930552037 3bsc@sina.com China 15813 69
Alfa Aesar 400-6106006 saleschina@alfa-asia.com China 30103 84
TCI (Shanghai) Development Co., Ltd. 021-67121386 Sales-CN@TCIchemicals.com China 24512 81
Energy Chemical 400-0056266 sales8178@energy-chemical.com China 44850 61
Shanghai Hanhong Scientific Co.,Ltd. 021-54306202 13764082696 info@hanhongsci.com China 42917 64
Shandong Xiya Chemical Co., Ltd 13355009207 13355009207 3007715519@qq.com China 18722 57
Syntechem Co.,Ltd info@syntechem.com China 12973 57
Supplier Advantage
Shanghai Yingxin Laboratory Equipment Co., Ltd. 58
J & K SCIENTIFIC LTD. 76
Meryer (Shanghai) Chemical Technology Co., Ltd. 62
3B Pharmachem (Wuhan) International Co.,Ltd. 69
Alfa Aesar 84
TCI (Shanghai) Development Co., Ltd. 81
Energy Chemical 61
Shanghai Hanhong Scientific Co.,Ltd. 64
Shandong Xiya Chemical Co., Ltd 57
Syntechem Co.,Ltd 57

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View Latest Price from 4-(4-Nitrophenyl)azoresorcinol manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
4-(4-Nitrophenyl)azoresorcinol pictures 2026-09-02 4-(4-Nitrophenyl)azoresorcinol
74-39-5
 $2.00-5.00 1kg 99% Henan Fengda Chemical Co., Ltd
4-(4-Nitrophenylazo)resorcinol pictures 2026-05-28 4-(4-Nitrophenylazo)resorcinol
74-39-5
 $2.00-5.00 1KG 99% 10000kg Hebei Chuanghai Biotechnology Co,.LTD
4-(4-Nitrophenyl)azoresorcinol pictures 2025-12-24 4-(4-Nitrophenyl)azoresorcinol
74-39-5
 1KG 98.0% 10 Shaanxi Dideu Medichem Co. Ltd

4-(4-Nitrophenyl)azoresorcinol Spectrum

4-(4-Nitrophenyl)azoresorcinol(74-39-5)MS4-(4-Nitrophenyl)azoresorcinol(74-39-5)1HNMR4-(4-Nitrophenyl)azoresorcinol(74-39-5)13CNMR4-(4-Nitrophenyl)azoresorcinol(74-39-5)IR1

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1of4

3-Benzenediol,4-[(4-nitrophenyl)azo]-1 MagnesonⅠ 1,3-Benzenediol,4-[(4-nitrophenyl)azo]- 2,4-Dihydroxy-4-nitroazobenzene MAGNESON I LABOTEST-BB LT00455004 AZO VIOLET AZOVIOLET BENZENE 4-(4'-NITROPHENYLAZO)-RESORCINOL 4-(4-NITROPHENYLAZO)RESORCINOL 4-(P-NITROBENZENEAZO)RESORCINOL 4-(P-NITROPHENYLAZO)ORCINOL 4-(P-NITROPHENYLAZO)RESORCINOL P-NITROBENZENEAZORESORCINOL TIMTEC-BB SBB008851 4-(4-NITROPHENYLAZO)RESORCINOL, FOR THE DETERMINATION OF MG 4-(4-NITROPHENYLAZO)-RESORCINOL ADSORPTI ON INDICATOR MagnesonIiGr 4-(4-Nitrophenylazo)-ResorcinolA.R. MagnesonIGr 4-(4-Nitrophenylazo)resorcinol, 98+% 4-(4-Nitrophenylazo)resorcinol, dye content ca 90% PARA-NITROPHENYLAZORESORCINOL Azoviolet, Magneson I 4-[(4-nitrophenyl)diazenyl]-1,3-benzenediol 4-(4-Nitrophenylazo)resorcinol,dye content ca90% p-Nitroazobenzene-2,4-diol o-p-Dihydroxyazo-p-nitrobenzene 4-(4-NITROPHENYLAZO) MagnesonⅠ[4-(4-Nitrophenylazo)resorcinol] Resorcinazo-p-nitrobenzene Azo Violet 4-(4-Nitrophenylazo)resorcinol MagnesiuM Reagents Ⅰ 4-((4-Nitrophenyl)diazenyl)benzene-1,3-diol 4-(4-Nitrophenylazo)resorcinol, for analysis (E)-4-((4-nitrophenyl)diazenyl)benzene-1,3-diol 4-((4-nitrophenyl)azo)-3-benzenediol 4-((p-nitrophenyl)azo)-resorcino 4-[(4-Nitrophenyl)azo]-1,3-benzenediol 4-[(4-nitrophenyl)azo]-3-benzenediol p-diazviolet 4-(p-NITROPHENYLAZO)-RESORCINOL4-(p-NITROPHENYLAZO)-RESORCINOL4-(p-NITROPHENYLAZO)-RESORCINOL Azo violet indicator solution MagnesonⅠ, AR 0.2w/v% Azoviolet Benzene Solution 4-(4-NITROPHENYLAZO)-RESORCINOL FOR SYNT 1,3-Benzenediol, 4-[2-(4-nitrophenyl)diazenyl]- Azo Violet Indicator Magneson I, GR indicator Magneson I AR Magnesium reagent I MagnesonⅠ[4-(4-Nitrophenylazo)resorcinol] MAGNESON MagnesonⅠ 74-39-5 C12H9N3O4 NO2C6H4NNC6H3OH2 O2NC6H4N2C6H3OH2