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×î½üÎÒÃÇ×éÔÚ Organometallics ÔÓÖ¾·¢±íÁËÌâΪPhotofragmentation of Gas-Phase Lanthanide Cyclopentadienyl Complexes: Experimental and Time-Dependent Excited-State Molecular DynamicsµÄÎÄÕ£¬ÎÄÕ²ûÊöÁËÓÃʱ¼ä·ÉÐÐÖÊÆ×¼ì²â¼¤¹â·Ö½âµÄÆøÌ¬Ï¡ÍÁÅäºÏÎï(·Ö×ÓÊø)Ë鯬, Ñо¿ÆøÌ¬ÅäºÏÎïµÄ¹â·Ö½â»úÀí£¬²¢ÇÒʹÓü¤·¢Ì¬·Ö×Ó¶¯Á¦Ñ§Ä£ÄâÀ´ÀíÂÛÔ¤²âºÍ֤ʵ¹â·Ö½â»úÀí¡£ÎÄÕÂÉæ¼°Ê±¼ä·ÉÐÐÖÊÆ×´î½¨¼°¼ì²â£¬ÆøÌ¬ÅäºÏÎï·Ö×ÓÊøµÄÐγɣ¬ÖÊÆ×µÄ·ÖÎö£¬¼¤·¢Ì¬·Ö×Ó¶¯Á¦Ñ§Ä£Ä⣬ÒÔ¼°ÈçºÎÓðÑÀíÂÛÄ£ÐÍÓ¦Óõ½ÊµÑéÖеȣ¬ÎÄÕÂ13Ò³£¬ÒýÎÄ49ƪ¡£Ï£ÍûµÃµ½´ó¼ÒÅúÆÀÖ¸Õý£¬¹²Í¬Ñ§Ï°¡£

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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·ÖÏí¼¤¹â·Ö½âÏ¡ÍÁïºÍÎÒÔ¼°¼¤·¢Ì¬·Ö×Ó¶¯Á¦Ñ§Ä£ÄâµÄÎÄÕÂ
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  • 2015-12-11 00:42:56, 4.83 M

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