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Photodissociation Dynamics of Iodoform in Solution

机译:溶液中碘仿的光解离动力学

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The photodissociation dynamics of iodoform (CH_3) in acetonitrile and cyclohexane were investigated by femtosecond pump-probe spectroscopy and nanosecond laser flash photolysis. We have measured transient absorption spectra in the spectral region of 370-730 nm and kinetics at selected wavelengths on a femtosecond-microsecond time scale. We assign the observed photoproduct with absorption maxima at 450 and 600 nm, formed upon excitation of iodoform at 350 nm in acetonitrile and cyclohexane, to the isomer of iodoform, iso-iodoform (CHI_2-I). The iso-iodoform is most probably formed via an in-cage recombination of the produced photofragments, the I atom and the CHI_2 radical, with an ~7 ps time constant. The lifetime of the ios-iodoform is found to be ~1.8 and 0.2 μs in cyclohexane and acetonitrile, respectively.
机译:用飞秒泵浦探针光谱法和纳秒激光闪光光解法研究了碘仿(CH_3)在乙腈和环己烷中的光解离动力学。我们已经测量了在370-730 nm光谱范围内的瞬态吸收光谱,并在飞秒-微秒时间尺度上测量了选定波长的动力学。我们将在乙腈和环己烷中在350 nm处的碘仿激发后在450和600 nm处具有最大吸收峰的观察到的光产物分配给碘仿,异碘仿(CHI_2-I)的异构体。异碘仿很可能是通过笼中发生的光片段,I原子和CHI_2自由基的重组而形成的,时间常数约为〜7 ps。在环己烷和乙腈中,ios-iodoform的寿命分别为〜1.8和0.2μs。

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