Used as a photochromic compound in smart materials and optical devices. Its azo group (–N=N–) enables reversible trans-cis isomerization upon exposure to light, making it suitable for light-responsive coatings, molecular switches, and data storage systems. The nitrophenyl and hydroxy groups enhance polarity and stability, improving performance in polymer matrices. Also investigated for use in sensors and photo-regulated drug delivery due to its controlled structural change under UV/visible light.