Photophysics of the 2-(2′-hydroxyphenyl)perimidines: Photostability studies

Abstract Photophysical characterization of perimidine 1 , 1-methylperimidine 2 , 2-phenylperimidine 3 , 1-methyl-2-phenylperimidine 4 , 2-(2′-hydroxyphenyl)perimidine 5 , 1-methyl-2-(2′-hydroxyphenyl)perimidine 6 , 2-(2′-methoxyphenyl)perimidine 7 and 1-methyl-2-(2′-methoxyphenyl)perimidine 8 has been achieved. All derivatives exhibit a high photostability against the UV light with small photochemical quantum yields o r in the range of 10 −5 –10 −6 , implying that non-radiative processes different from the excited state intramolecular proton transfer (ESIPT) mechanism are responsible for their photophysics.