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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Reactivity patterns for the activation of CO2 and CS2 with alumoxane and aluminum hydrides
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Reactivity patterns for the activation of CO2 and CS2 with alumoxane and aluminum hydrides

机译:用铝氧烷和氢化物激活CO2和CS2的反应性模式

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Carbon dioxide is readily fixed when reacting with either alumoxane dihydride [{(LAl)-L-Me(H)}(2)(mu-O)] (1) or aluminum dihydride [(LAlH2)-L-Me] (2) (L-Me = HC[(CMe)N(2,4,6-Me3C6H2)](2)(-)) to produce bimetallic aluminum formates [((LAl)-L-Me)(2)(mu-OCHO)(2)(mu-O)] (3) and [((LAl)-L-Me)(2)(mu-OCHO)(2)(mu-H)(2)] (5), respectively. Furthermore, [((LAl)-L-Me)(2)(mu-OCHO)(2)(mu-OH)(2)] (4) is easily obtained upon the reaction of 3 or 5 with H2O. The stability of the unusual dialuminum diformate dihydride core observed in 5 stems from the proximity of the Al centers allowing the formation of two Al-H center dot center dot center dot Al bridges and precluding further hydride transfer to the HCO2 moieties. Contrary to this behavior, 1 and 2 react with CS2 giving cyclic alumoxane and aluminum sulfides [((LAl)-L-Me)(2)(mu-S)(mu-O)] (6) and [{(LAl)-L-Me(mu-S)}(2)] (7), respectively. The molecular structures of 3-7 were characterized by IR, Raman, solution or solid-state (MAS) NMR spectroscopy and mass spectrometry and for 4-7 were characterized by X-ray diffraction studies. NMR kinetic studies and DFT calculations suggest that the mechanisms for the formation of 6 and 7 involve the transfer of a hydride group forming transient aluminum thioformate intermediates which proceed to form Al-S-Al moieties through the cleavage of C-S bonds and insertion of a sulfur atom, followed by the elimination of thioformaldehyde.
机译:用铝氧氧氧氧酯二氢化物反应[{(LAL)-L-ME(H)}(2)(2)(2)(mU-O)](1)或铝二氢盐[(LALH2)-L-ME]时,易于固定二氧化碳[(LALH2)-L-ME] )(L-Me = HC [(CME)N(2,4,6-ME3C6H2)](2)( - ))生产双金属铝甲酸酯[((LAL)-L-ME)(2)(mU- OCHO)(2)(mU-O)](3)和[(((lal)-L-me)(2)(2)(mu-Ocho)(2)(2)(2)(2)](5)分别。此外,在用H 2 O的反应时容易获得[((LAL)-L-ME)(2)(2)(2)(2)(2)(2)(4)。在5个茎中观察到的异常溶溶液的稳定性,从Al中心接近允许形成两个Al-H中心点中心点中心点Al桥,并排除进一步的氢化物转移到HCO2部分。与此行为相反,1和2与CS2反应,得到环状铝氧烷和硫化铝[((lal)-L-me)(2)(mu-s)(mu-o)](6)和[{(lal) -L-ME(MU-S)}(2)](7)分别。通过IR,拉曼,溶液或固态(MAS)NMR光谱和质谱表征3-7的分子结构,并通过X射线衍射研究表征4-7。 NMR动力学研究和DFT计算表明,形成6和7的机制涉及形成氢化物组的转移,形成瞬态铝制硫醚中间体,其通过CS键的切割和插入硫的切割形成Al-S-Al部分原子,然后消除硫醚醛。

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