Líquido iônico [bmim.PF6] como solvente: um meio conveniente para estudos por fotólise por pulso de laser

Química Nova

Ada Ruth Bertoti¹  José Carlos Netto-ferreira¹ 

[1] ,Universidade Federal da Bahia Departamento de Química Geral e Inorgânica Salvador BA ,Brasil

关键词: ionic liquids;    laser flash photolysis;    triplet excited state;   

DOI  :  10.1590/S0100-40422009000700040

来源: SciELO

【 摘 要 】

The spectroscopic behavior of thioxanthone and benzil (diphenylethanedione or dibenzoyl) in the ionic liquid [bmim.PF6] has been investigated employing the laser flash photolysis technique. Triplet-triplet absorption spectra for these carbonyl compounds in [bmim.PF6] are similar to those observed in organic solvents. The triplet lifetime for thioxanthone in desogygenated samples is very long (71 μs), whereas in oxygen-saturated solution is 500 ns, which indicates the low oxygen solubility in this solvent. For benzil, lifetimes of 10 μs in [bmim.PF6] and 3.8 μs in acetonitrile were obtained. The decay for triplet thioxanthone and benzil follows a clear first order kinetics in [bmim.PF6], from which one can conclude that triplet-triplet annihilation is not an important decay process in this solvent.

【 授权许可】

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