Substances with same chemical structure but different molecular arrangement and crystal structure are called crystal polymorphs. By changing the crystal preparation method and controlling the molecular arrangement and crystal structure, it is possible to change the optoelectronic properties. For example, diamond and graphite have different properties due to their different crystal structures, even though they are composed of the same carbon. Clearly distinguishing the crystal polymorphs is important in the development of functional materials and pharmaceuticals. I have shown that crystal polymorphs are formed for the first time in TPCO and clarified the optical properties of four types of TPCO crystal polymorphs with different molecular orientations and crystal structures.

https://pubs.rsc.org/en/content/articlelanding/2023/tc/d2tc04151k