Nakagawa, Takeshi published the artcilePiezochromic luminescence of dicoronylene: Key for revealing hidden Raman modes at high pressure, HPLC of Formula: 191-07-1, the publication is Carbon (2022), 563-569, database is CAplus.
Mol. crystals of dicoronylene (C48H20), a member of very large polycyclic aromatic hydrocarbons (PAHs), exhibits strong red fluorescence under ambient conditions. This strong fluorescence induced by visible light excitation obscures entire Raman spectrum of dicoronylene. The authors employed in-situ high-pressure luminescence spectroscopy to observe a reversible piezochromic effect, in which the fluorescence exhibits a drastic red shift with a rapid quenching of intensity. At >4 GPa, under red shifted and reduced fluorescence, hidden Raman modes are observed with 532 nm green laser at ¡Ü20 GPa. The application of pressure can finely tune the fluorescence of dicoronylene, allowing the observation of the Raman spectrum with an appropriate laser wavelength and dicoronylene has high chem. stability among PAH mols. with multiple aromatic rings.
Carbon published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, HPLC of Formula: 191-07-1.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia