最近我們組在 Organometallics 雜志發(fā)表了題為Photofragmentation of Gas-Phase Lanthanide Cyclopentadienyl Complexes: Experimental and Time-Dependent Excited-State Molecular Dynamics的文章,文章闡述了用時間飛行質譜檢測激光分解的氣態(tài)稀土配合物(分子束)碎片, 研究氣態(tài)配合物的光分解機理,并且使用激發(fā)態(tài)分子動力學模擬來理論預測和證實光分解機理。文章涉及時間飛行質譜搭建及檢測,氣態(tài)配合物分子束的形成,質譜的分析,激發(fā)態(tài)分子動力學模擬,以及如何用把理論模型應用到實驗中等,文章13頁,引文49篇。希望得到大家批評指正,共同學習。
摘要:
Unimolecular gas-phase laser-photodissociation reaction mechanisms of open-shell lanthanide cyclopentadienyl
complexes, Ln(Cp)3 and Ln(TMCp)3, are analyzed from experimental and computational perspectives. The most probable
pathways for the photoreactions are inferred from photoionization time-of-flight mass spectrometry (PI-TOF-MS), which
provides the sequence of reaction intermediates and the distribution of final products. Time-dependent excited-state molecular
dynamics (TDESMD) calculations provide insight into the electronic mechanisms for the individual steps of the laser-driven
photoreactions for Ln(Cp)3. Computational analysis correctly predicts several key reaction products as well as the observed
branching between two reaction pathways: (1) ligand ejection and (2) ligand cracking. Simulations support our previous
assertion that both reaction pathways are initiated via a ligand-to-metal charge-transfer (LMCT) process. For the more complex
chemistry of the tetramethylcyclopentadienyl complexes Ln(TMCp)3, TMESMD is less tractable, but computational geometry
optimization reveals the structures of intermediates deduced from PI-TOF-MS, including several classic “tuck-in” structures and
products of Cp ring expansion. The results have important implications for metal−organic catalysis and laser-assisted metal−
organic chemical vapor deposition (LCVD) of insulators with high dielectric constants.
Photofragmentation of Gas-Phase Lanthanide Cyclopentadienyl Complexes: Experimental and Time-Dependent Excited-State Molecular Dynamics
J Chen, AM Hochstatter, D Kilin, PS May, Q Meng… Organometallics 2014, 33, 1574−1586![分享激光分解稀土茂和物,以及激發(fā)態(tài)分子動力學模擬的文章]()
om-2013-00953q_0017.gif |