Used as a photosensitizer in photodynamic therapy (PDT) for cancer treatment due to its ability to generate reactive oxygen species (ROS) under light irradiation, enabling the destruction of cancer cells. Its carboxyphenyl groups allow for easy conjugation to nanoparticles, polymers, or biomolecules, making it suitable for targeted and light-responsive drug delivery systems. Additionally, it functions as a fluorescent sensor for gases or biomolecules, owing to its stable structure and clear luminescence changes upon specific binding. It is also employed in dye-sensitized solar cells (DSSC), optoelectronic materials, and photocatalytic processes for environmental remediation, such as the degradation of organic pollutants under visible light. The zinc metal center enhances stability and influences electronic properties critical for efficient energy transfer in photochemical applications.