Photocatalytic reactions often involve the absorption of light to create excited states in the catalyst. The efficiency of these reactions can be improved if the excited states undergo ISC to form more reactive triplet states. These triplet states typically have longer lifetimes and can participate in various chemical transformations. For instance, in [TiO₂ photocatalysis](), ISC can lead to the creation of reactive oxygen species (ROS), which are essential for degrading pollutants.
