Photochemical and photophysical properties of various triaryl-2-pyrazolines

The main aim of the research was to obtain a detailed insight into the photochemical and photophysical properties of various triaryl-2- pyrazolines, with a view to understanding better their role in photoconductive materials. The technique of laser flash photolysis, in both transmission and diffuse reflectance mode, was employed to study the compounds as microcrystalline powders, within polymer films, on fabrics and in solution. In those media where the triplet state was not directly observed it was sensitized with a suitable triplet energy donor such as benzophenone. [Continues.]