2-(4-Hydroxyphenylazo)benzoic acid

Synonym(s):2-(4′-Hydroxybenzeneazo)benzoic acid;4′-Hydroxyazobenzene-2-carboxylic acid;HABA;HBABA

CAS NO.：1634-82-8
Empirical Formula: C13H10N2O3
Molecular Weight: 242.23
MDL number: MFCD00002428
EINECS: 216-655-2
SAFETY DATA SHEET (SDS)
Update Date: 2023-10-25 15:14:13

2-(4-Hydroxyphenylazo)benzoic acid Structural

What is 2-(4-Hydroxyphenylazo)benzoic acid?

Chemical properties

light yellow to orange powder

The Uses of 2-(4-Hydroxyphenylazo)benzoic acid

2-(4-Hydroxyphenylazo)benzoic acid may be used in the preparation of:

2-((4-(3,4-dicyanophenoxy)phenyl)diazenyl)benzoic acid
2,2′-((((4,5-dicyano-1,2-phenylene)bis(oxy))bis(4,1-phenylene))bis(diazene-2,1-diyl)) dibenzoic acid
a multifunctional benzoxazine monomer

Definition

ChEBI: An azo compound that is azobenzene in which one phenyl group is substituted at position 4 by a hydroxy group, while the other phenyl group is substituted at position 2 by a carboxy group. It is used as a matrix in matrix-assisted laser desorption/ionizatio (MALDI) mass spectrometry.

General Description

2-(4-Hydroxyphenylazo)benzoic acid) (HABA), can be used for desorption of proteins, peptides and glycoproteins, thereby making it very advantageous for matrix-assisted laser desorption ionization mass spectrometry.

Properties of 2-(4-Hydroxyphenylazo)benzoic acid

Melting point:	204-208 °C(lit.)
Boiling point:	385.05°C (rough estimate)
Density	1.2480 (rough estimate)
refractive index	1.5300 (estimate)
storage temp.	Store below +30°C.
solubility	ethanol: 20 mg/mL, clear
form	powder to crystal
pka	3.40±0.36(Predicted)
color	Light yellow to Brown
BRN	1842696
Stability:	Stable. Incompatible with strong oxidizing agents.
CAS DataBase Reference	1634-82-8(CAS DataBase Reference)
EPA Substance Registry System	Benzoic acid, 2-[(4-hydroxyphenyl)azo]- (1634-82-8)

Safety information for 2-(4-Hydroxyphenylazo)benzoic acid

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405:Store locked up.