Used in the synthesis of phthalocyanine dyes, which are essential in the production of pigments for inks, coatings, and plastics. It also plays a role in the development of advanced materials, such as organic semiconductors and photovoltaic cells, due to its ability to form stable, conjugated structures. Additionally, it is utilized in the creation of fluorescent markers for biological imaging and diagnostic applications. Its incorporation into polymers enhances their thermal and chemical stability, making it valuable in high-performance materials. Furthermore, phthalocyanine derivatives are studied for medical applications, such as photodynamic therapy for cancer, where they generate singlet oxygen to destroy cancer cells upon light activation.