2-(4-Hydroxyphenylazo)benzoic acid (CAS 1634-82-8)

2-(4-Hydroxyphenylazo)benzoic acid (2-HPBA) is an organic compound classified as a phenolic azo dye, characterized by its reddish-brown solid form. Its application as a dye extends to various industries. Additionally, 2-(4-Hydroxyphenylazo)benzoic acid serves as a valuable model compound in scientific research for investigating the properties of azo dyes. The chemical structure of 2-(4-Hydroxyphenylazo)benzoic acid consists of a phenol group linked to both an azo group and a carboxylic acid group. The distinctive coloration of the compound can be attributed to the azo group. In scientific research, 2-(4-Hydroxyphenylazo)benzoic acid has been extensively examined as a model compound to gain insights into the photophysical and photochemical properties of azo dyes. Moreover, its reactivity with different substrates and interactions with proteins have been studied. Notably, 2-(4-Hydroxyphenylazo)benzoic acid exhibits photosensitivity, enabling it to absorb light and engage in photochemical reactions. Upon exposure to light, the azo group within 2-(4-Hydroxyphenylazo)benzoic acid undergoes cleavage, resulting in the generation of a free radical. This free radical can subsequently participate in diverse photochemical reactions by reacting with other compounds.