Cheng, Jinling published the artcileComprehensive Studies on Excited-State Proton Transfer of a Series of 2-(2′-Hydroxyphenyl)benzothiazole Derivatives: Synthesis, Optical Properties, and Theoretical Calculations, Safety of 2-Hydroxy-4-(trifluoromethyl)benzoic acid, the publication is Journal of Physical Chemistry C (2015), 119(8), 4242-4251, database is CAplus.
A group of novel 2-(2′-hydroxyphenyl)benzothiazole derivatives (1-4) with excited-state intramol. proton transfer (ESIPT) character were synthesized. Their photophys. properties were studied by means of steady-state absorption and fluorescence spectra and time-resolved emission method as well as theor. calculation in a variety of solvents. All of these compounds can yield single fluorescence at the green region in nonpolar solvents such as n-hexane, while dual fluorescence consisting of the blue and green bands was captured in strong polar solvents like acetonitrile. In addition, a third emission band between the former two bands was detected for these mols. simultaneously with the blue and green ones generating the well-structured triple fluorescence in protic solvent like ethanol. Systematical comparison of the fluorescence of these compounds in a series of solvents demonstrated that nonpolar solvents would facilitate ESIPT process and the green emission from the keto format, while the strong polar solvents impede the ESIPT process and favor the blue normal emission from enol. Protic solvents facilitate deprotonation and make the phenolic anion coexist with keto and enol and consequently lead to triple fluorescence. On the premise of identical keto emission intensity, the normal emission intensity of these compound increases consecutively in the order of increasing electron-withdrawing ability of the substituents regardless of solvents. The results of quantum-chem. calculations are well in line with the exptl. spectra.
Journal of Physical Chemistry C published new progress about 328-90-5. 328-90-5 belongs to alcohols-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Carboxylic acid,Benzene,Phenol, name is 2-Hydroxy-4-(trifluoromethyl)benzoic acid, and the molecular formula is C8H5F3O3, Safety of 2-Hydroxy-4-(trifluoromethyl)benzoic acid.
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