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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >IR and UV Spectroscopy of Vapor-Phase Jet-Cooled Ionic Liquid [emim]~+[Tf_2N]~?: Ion Pair Structure and Photodissociation Dynamics
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IR and UV Spectroscopy of Vapor-Phase Jet-Cooled Ionic Liquid [emim]~+[Tf_2N]~?: Ion Pair Structure and Photodissociation Dynamics

机译：气相喷射冷却离子液体[emim]〜+ [Tf_2N]〜？的红外和紫外光谱：离子对结构和光解离动力学

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摘要

Small gas-phase clusters (ion pairs) of the ionic liquid [emim]~+[Tf_2N]~? have been generated in a supersonic expansion. Clusters are investigated via UV photofragmentation and time-of-flight mass spectrometry. Spectra between 42 000 and 45 000 cm~(?1) reveal dynamical branching between direct dissociation of the ion pair to the cation and anion and to radical species. The IR spectrum between 2800 and 3200 cm~(?1) was measured by action spectroscopy. Multiple conformations of the ion pair are found to be present in the molecular beam, leading to broad spectral features, further complicated by hydrogen bonding and Fermi resonances. The measured and theoretical spectra compare well, and the jet-cooled ion pair structures present in the molecular beam are strongly hydrogen bonded “stacked” conformers.
机译：离子液体[emim]〜+ [Tf_2N]〜？的小气相簇（离子对）。是在超音速膨胀中产生的。通过紫外光碎裂和飞行时间质谱研究团簇。在42 000和45 000 cm〜（？1）之间的光谱揭示了离子对直接离解与阳离子和阴离子以及自由基之间的动态分支。通过作用光谱法测定2800至3200cm 2（λ1）之间的IR光谱。发现分子束中存在离子对的多种构象，从而导致宽光谱特征，并因氢键和费米共振而进一步复杂化。实测和理论光谱比较好，并且分子束中存在的射流冷却离子对结构是强氢键结合的“堆积”构象异构体。

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