A fotorreatividade do estado excitado triplete de tioxantona (TX) foi investigada empregando a técnica de fotólise por pulso de laser. O máximo do comprimento de onda de absorção e o tempo de vida para o seu estado excitado triplete são dependetes do solvente. Quando foram utilizados solventes doadores de hidrogênio, foi observado o surgimento de uma nova banda no espectro de absorção para os transientes, com máximo a 410 nm, a qual foi atribuída ao radical cetila derivado da tioxantona. As constantes de velocidade de supressão para o triplete de tioxantona, k q , variaram de (1,7 ± 0,1) × 10 6 L mol -1 s -1 para tolueno a ca. 10 9 L mol -1 s -1 para fenol e seus derivados contendo substituintes poleres, bem como para indol, trietilamina e DABCO.The photoreactivity of the triplet excited state of thioxanthone (TX) was investigated employing the laser flash photolysis technique. The wavelength for the absorption maximum and the lifetime of the triplet excited state are solvent dependent. When hydrogen donor solvents were employed, a new band at 410 nm was observed in the triplet absorption spectrum, which was attributed to the ketyl radical derived from thioxantone. Quenching rate constants, k q , ranged from (1.7 ± 0.1) × 10 6 L mol -1 s -1 for toluene to ca. 10 9 L mol -1 s -1 for phenol and its derivatives containing polar substituents, as well as for indole, triethylamine and DABCO.
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