Platinum ω-Alkenyl Compounds as Chemical Vapor Deposition Precursors. Mechanistic Studies of the Thermolysis of Pt[CH<sub>2</sub>CMe<sub>2</sub>CH<sub>2</sub>CH═CH<sub>2</sub>]<sub>2</sub> in Solution and the Origin of Rapid Nucleation
作者:Sumeng Liu、Zhejun Zhang、John R. Abelson、Gregory S. Girolami
DOI:10.1021/acs.organomet.0c00542
日期:2020.11.9
equiv of 4,4-dimethylpentenes by addition of a hydrogen atom to the pentenyl ligands in 3. The “extra” hydrogen atoms arise by dehydrogenation of other pentenyl ligands; some of these dehydrogenated ligands are released as methyl-substituted methylenecyclobutanes and cyclobutenes. A combination of isotope labeling and kinetic studies suggests that 3 decomposes by C–H activation of both allylic and olefinic
化合物顺式-双(η 1,η 2 -2,2-二甲基戊-4-烯-1-基)铂,铂[CH 2 CME 2 CH 2 CH = CH 2 ] 2(3),是最近发现的化学气相沉积(CVD)前体,用于在各种基材上沉积高度光滑的铂薄膜,而没有成核延迟。本文介绍了3在溶液中加热时发生反应的途径的详细机理研究。在90至130°C之间的各种溶剂中,3通过分解成3个戊烯基配体中的氢原子,分解生成约1当量的4,4-二甲基戊烯。“额外的”氢原子是通过其他戊烯基配体的脱氢而产生的。这些脱氢配体中的一些以甲基取代的亚甲基环丁烷和环丁烯的形式释放。同位素标记和动力学研究的结合表明,3可以通过C–H烯丙基和烯烃C–H键的活化来分解,得到瞬态氢化铂中间体,然后通过还原消除步骤形成戊烯产物,但确切的机理是溶剂依赖性。在C 6 F 6,溶剂缔合发生在C–H键活化之前,而热解的速率决定步骤最有可能形成Ptσ络合物。在烃类溶剂中,在C