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4-(2'-Pyridylazo)-resorcinol free acid

4-(2'-Pyridylazo)-resorcinol free acid structure

CAS No.: 1141-59-9

Chemical Name:: 4-(2'-Pyridylazo)-resorcinol free acid

Synonyms: 4-(2-PYRIDYLAZO)RESORCINOL;PAR NSC 148355;PAR, Reagent;ParIndicatorGr;PAR,REAGENT,ACS;TIMTEC-BB SBB008938;4-(2-Pyridylazo)reso;P.A.R. Free Acid ACS;4-(Pyridin-2-yldiazenyl)

CBNumber:: CB1706042

Molecular Formula:: C11H9N3O2

Molecular Weight:: 215.21

MDL Number:: MFCD00006256

MOL File:: 1141-59-9.mol

MSDS File:: SDS

TDS File:: TDS

Last updated:2026-05-27 23:45:16

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4-(2'-Pyridylazo)-resorcinol free acid Properties

Melting point	192-202 °C(lit.)
Boiling point	355.48°C (rough estimate)
Density	1.2579 (rough estimate)
refractive index	1.4930 (estimate)
storage temp.	room temp
solubility	DMSO (Slightly), Methanol (Slightly)
pka	8.18±0.35(Predicted)
form	Powder
color	Orange
Water Solubility	Soluble in water (partly), and ethanol (slightly). Insoluble in ether, and low-polarity solvents.
BRN	184665
Major Application	diagnostic assay manufacturing hematology histology
InChI	1S/C11H9N3O2/c15-8-4-5-9(10(16)7-8)13-14-11-3-1-2-6-12-11/h1-7,15-16H/b14-13+
InChIKey	RJNYNDHYSJRRDW-BUHFOSPRSA-N
SMILES	Oc1ccc(\N=N\c2ccccn2)c(O)c1
CAS DataBase Reference	1141-59-9(CAS DataBase Reference)
FDA UNII	N68T40H95T
EPA Substance Registry System	1,3-Benzenediol, 4-(2-pyridinylazo)- (1141-59-9)
UNSPSC Code	12352104
NACRES	NA.47

SAFETY

Risk and Safety Statements

Symbol(GHS)

GHS06,GHS07

Signal word

Danger

Hazard statements

H301+H311+H331-H315-H319-H335

Precautionary statements

P280a-P304+P340-P305+P351+P338-P501a-P261-P264-P270-P271-P280-P301+P310+P330-P302+P352+P312+P361+P364-P304+P340+P311-P305+P351+P338+P337+P313-P403+P233-P405-P501

PPE

dust mask type N95 (US), Eyeshields, Gloves

Hazard Codes

Risk Statements

36/37/38

Safety Statements

26-36

RIDADR

2811

WGK Germany

TSCA

TSCA listed

HazardClass

6.1

PackingGroup

III

HS Code

29333990

Storage Class

11 - Combustible Solids

NFPA 704

	1
2		0

4-(2'-Pyridylazo)-resorcinol free acid price More Price(34)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Sigma-Aldrich	8.41016	4-(2′-Pyridylazo)-resorcinol ≥98%	1141-59-9	5G	$194	2026-04-30	Buy
Sigma-Aldrich	323209	4-(2-Pyridylazo)resorcinol 96%	1141-59-9	5g	$199	2026-04-30	Buy
Sigma-Aldrich	323209	4-(2-Pyridylazo)resorcinol 96%	1141-59-9	25g	$860	2026-04-30	Buy
TCI Chemical	A5001	PAR [=4-(2-Pyridylazo)resorcinol][Spectrophotometric reagent for transition metals] >98.0%(HPLC)(T)	1141-59-9	1g	$39	2026-04-30	Buy
TCI Chemical	A5001	PAR [=4-(2-Pyridylazo)resorcinol][Spectrophotometric reagent for transition metals] >98.0%(HPLC)(T)	1141-59-9	5g	$150	2026-04-30	Buy

Product number	Packaging	Price	Buy
8.41016	5G	$194	Buy
323209	5g	$199	Buy
323209	25g	$860	Buy
A5001	1g	$39	Buy
A5001	5g	$150	Buy

4-(2'-Pyridylazo)-resorcinol free acid Chemical Properties, Uses, Production

Chemical Properties

ORANGE POWDER

Uses

4-(2-Pyridylazo)resorcinol is used in studies of zinc release from Escherichia coli aspartate transcarbamoylase. It is used in cloud point extraction of copper, zinc, cadmium, and nickel in water samples. It is used in the chelate titration of aluminum, mercury, lead and nickel. It is employed as reagent in the colorimetric analysis of gold, cobalt, chromium, iron.

General Description

for synthesis

Purification Methods

Purify PAR as the sodium salt by recrystallisation from 1:1 EtOH/water. Purity can be checked by TLC using a silica gel plate and a mixed solvent (n-BuOH:EtOH:2M NH3; 6:2:2). [Beilstein 22 I 694, 22 III/IV 7074, 22/14 V 619.]

4-(2'-Pyridylazo)-resorcinol free acid Preparation Products And Raw materials

Raw materials

Preparation Products

4-(2'-Pyridylazo)-resorcinol free acid Suppliers

Global Suppliers ( 220)

Supplier	Tel	Email	Country	ProdList	Advantage
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
Shandong Xiya Chemical Co., Ltd	13355009207 13355009207	3007715519@qq.com	China	18722	57
Syntechem Co.,Ltd		info@syntechem.com	China	12973	57
Tianjin heowns Biochemical Technology Co., Ltd.	400 638 7771	sales@heowns.com	China	14412	57
Sinopharm Chemical Reagent Co,Ltd.	86-21-63210123	sj_scrc@sinopharm.com	China	9791	79

Supplier	Advantage
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
Shandong Xiya Chemical Co., Ltd	57
Syntechem Co.,Ltd	57
Tianjin heowns Biochemical Technology Co., Ltd.	57
Sinopharm Chemical Reagent Co,Ltd.	79

View Latest Price from 4-(2'-Pyridylazo)-resorcinol free acid manufacturers

Update time	Product	Price	Min. Order	Purity	Supply Ability	Manufacturer
2026-06-30	4-(2-PYRIDYLAZO)RESORCINOL 1141-59-9		1kg	99%	10000KGS	Shaanxi Dideu New Materials Co. Ltd
2026-05-28	4-(2-Pyridinylazo)resorcinol 1141-59-9	$2.00-5.00	1KG	99%	10000kg	Hebei Chuanghai Biotechnology Co,.LTD
2025-12-24	4-(2-PYRIDYLAZO)RESORCINOL 1141-59-9		1KG	99.0%	10tons	Shaanxi Dideu Medichem Co. Ltd

4-(2-PYRIDYLAZO)RESORCINOL
1141-59-9
$0.00
99%
Shaanxi Dideu New Materials Co. Ltd

4-(2-Pyridinylazo)resorcinol
1141-59-9
$2.00-5.00
99%
Hebei Chuanghai Biotechnology Co,.LTD

4-(2-PYRIDYLAZO)RESORCINOL
1141-59-9
99.0%
Shaanxi Dideu Medichem Co. Ltd

4-(2'-Pyridylazo)-resorcinol free acid Spectrum

4-(2-PYRIDYLAZO)RESORCINOL(1141-59-9)MS 4-(2-PYRIDYLAZO)RESORCINOL(1141-59-9)¹HNMR 4-(2-PYRIDYLAZO)RESORCINOL(1141-59-9)¹³CNMR 4-(2-PYRIDYLAZO)RESORCINOL(1141-59-9)IR1 4-(2-PYRIDYLAZO)RESORCINOL(1141-59-9)IR2

1141-59-9 (4-(2'-Pyridylazo)-resorcinol free acid) Related Search:

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1of4

TIMTEC-BB SBB008938 3-Benzenediol,4-(2-pyridinylazo)-1 4-(2'-PYRIDYLAZO)-RESORCINOL [=4-(2-Pyridylazo)resorcinol] [SpectrophotoMetric reagent for transition Metals] PAR 4-(2-Pyridylazo)resorcinol, 99% 5GR 4-(2-Pyridylazo)reso (E)-4-(pyridin-2-yldiazenyl)benzene-1,3-diol 4-(2-Pyridylazo)-1,3-benzenediol 4-(Pyridin-2-yldiazenyl) 4- (2- pyridyl azo) - resorcinol indicator 4-(2-Pyridylazo)resorcinol(PAR) 4-(Pyridin-2-yldiazenyl)benzene-1,3-diol NSC 148355 PAR (resorcinol derivative) [=4-(2-Pyridylazo)resorcinol] [SpectrophotoMetric reagent for t 1,3-Benzenediol,4-[2-(2-pyridinyl)diazenyl]- 4-(2-pyridinylazo)-3-benzenediol 4-(2-PYRIDYLAZO)RESORCINOL 98% 4-(2-PYRIDYLAZO)RESORCINOL, FOR THE DETE RMINATION OF HG 4-(2-PYRIDYLAZO)RESORCINOL FREE ACID ParIndicatorGr (2-PyridylAzo)Resorcinol 4-(2-Pyridilazo)resorcinol, 99% 4-(2-pyridylazo)resorcinol, acs PAR,REAGENT,ACS 4-(2-PYRIDYLAZO)RESORCINOL (PAR) SPECTROPHOTOMETRIC REAGENT FOR TRANSITION METALS P.A.R. Free Acid ACS PAR [=4-(2-Pyridylazo)resorcinol] [Spectrophotometric reagent for transition metals] 4-(2-Pyridylazo)resorcinol,99% PAR [=4-(2-Pyridylazo)resorcinol] PAR, Reagent 2-(2,4-Dihydroxyphenylazo)pyridine 4-(2-Pyridinylazo)benzene-1,3-diol 4-[(2-Pyridinyl)azo]benzene-1,3-diol PAR[=4-(2-Pyridylazo)resorcinol][Spectrophotometricreagentfortransitionmetals]> 4-(2'-PYRIDYLAZO)-RESORCINOL FOR SYNTHES 4-(2-PYRIDYLAZO)RESORCINOL USP/EP/BP (4Z)-3-hydroxy-4-(pyridin-2-ylhydrazinylidene)cyclohexa-2,5-dien-1-one 4-(2-Pyridylazo)-resorcinol (and monosodium salt) 4-(2-PYRIDYLAZO)RESORCINOL 4-(2-Pyridylazo)resorcinol IND 1141-59-9 1141-59-5 Analytical Chromatography Product Catalog Indicators Metal Titration Indicators Titration Chelating Reagents Azo Compounds Pyridylazo Compounds Analytical Chemistry Azo Compounds Chelating Reagents Pyridylazo Compounds