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https://repositorio.ufba.br/handle/ri/3792
metadata.dc.type: | Artigo de Periódico |
Title: | Líquido iônico [bmim.PF6] como solvente: um meio conveniente para estudos por fotólise por pulso de laser |
Other Titles: | Química Nova |
Authors: | Bertoti, Ada Ruth Netto Ferreira, José Carlos |
metadata.dc.creator: | Bertoti, Ada Ruth Netto Ferreira, José Carlos |
Abstract: | 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. |
Keywords: | Ionic liquids laser flash photolysis Triplet excited state |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/3792 |
Issue Date: | 2009 |
Appears in Collections: | Artigo Publicado em Periódico (Química) |
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