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Formation of Organometallic Xenon Complexes in Conventional Fluids: A Time-resolved Infrared (TRIR) Study of the Photochemistry of W(CO)5(4AcPyr) (4-AcPyr=4-Acetylpyridine) in perfluoromethylcyclohexane (PFMCH)
Vibrational Spectroscopy ( IF 2.7 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.vibspec.2020.103053
Linjun Wu , Xue Z. Sun , Xue Wu , Michael W. George

Abstract The photochemistry and photophysics of W(CO)5(4-Acpy) in perfluoromethylcyclohexane (PFMCH) has been investigated using fast time-resolved infrared spectroscopy (TRIR). Analysis of these TRIR data shows that rradiation (400 nm) of W(CO)5(4-Acpy) in PFMCH results in the formation of a metal-to-ligand charge transfer (MLCT) excited state which decays (τ =330 ns) to reform mainly the parent and a small amount of a new photoproduct. The production of this new photoproduct is supported by the use of global analysis and assigned to the formation of W(CO)5(PFMCH). W(CO)5(PFMCH) is not stable and reacts with residual water to form (τ = 5 μs) W(CO)5(H2O). In the presence of Xe, irradiation of W(CO)5(4-Acpy) again results in formation of an MLCT excited state but under these conditions it decays slightly faster (τ =245 ns) which is consistent with the formation of W(CO)5(Xe). Global analysis supports the formation of W(CO)5(Xe) which is more stable than W(CO)5(PFMCH) and reacts more slowly (τ = 12 μs) to form W(CO)5(H2O).

中文翻译:

在常规流体中形成有机金属氙配合物:W(CO)5(4AcPyr)(4-AcPyr=4-乙酰吡啶)在全氟甲基环己烷 (PFMCH) 中的光化学的时间分辨红外 (TRIR) 研究

摘要 使用快速时间分辨红外光谱 (TRIR) 研究了 W(CO)5(4-Acpy) 在全氟甲基环己烷 (PFMCH) 中的光化学和光物理。对这些 TRIR 数据的分析表明,PFMCH 中 W(CO)5(4-Acpy) 的辐射 (400 nm) 导致金属到配体电荷转移 (MLCT) 激发态的形成,该激发态衰减 (τ = 330 ns ) 主要改革母公司和少量的新照片产品。这种新照片产品的生产得到了全球分析的支持,并被指定为 W(CO)5(PFMCH) 的形成。W(CO)5(PFMCH) 不稳定,会与残留水反应形成 (τ = 5 μs) W(CO)5(H2O)。在 Xe 的存在下,W(CO)5(4-Acpy) 的辐照再次导致 MLCT 激发态的形成,但在这些条件下它衰减稍快(τ = 245 ns),这与 W(CO)5(Xe) 的形成一致. 全局分析支持 W(CO)5(Xe) 的形成,W(CO)5(Xe) 比 W(CO)5(PFMCH) 更稳定,反应更慢 (τ = 12 μs),形成 W(CO)5(H2O)。
更新日期:2020-05-01
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