首页> 外文期刊>Journal of Organometallic Chemistry >SYNTHESIS, CHARACTERIZATION, REACTIVITY, AND CATALYTIC HYDROGENATION ACTIVITY OF THE HEXANUCLEAR HEXAHYDRIDO CARBONYL CLUSTER COMPOUND [RU-6(MU-H)(6)(MU(3),ETA(2)-AMPY)(2)(CO)(14)] (HAMPY=2-AMINO-6-METHYLPYRIDINE)
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SYNTHESIS, CHARACTERIZATION, REACTIVITY, AND CATALYTIC HYDROGENATION ACTIVITY OF THE HEXANUCLEAR HEXAHYDRIDO CARBONYL CLUSTER COMPOUND [RU-6(MU-H)(6)(MU(3),ETA(2)-AMPY)(2)(CO)(14)] (HAMPY=2-AMINO-6-METHYLPYRIDINE)

机译:六核六氢羰基簇合物[RU-6(MU-H)(6)(MU(3),ETA(2)-AMPY)(2)(CO)(14)的合成,表征,反应性和催化加氢活性)](HAMPY = 2-AMINO-6-METHYLPYRIDINE)

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摘要

The reaction of the 48-electron complex [Ru-3(mu-H)(mu(3),eta(2)-ampy)(CO)(9)] (1) (Hampy = 2-amino-6-methylpyridine) with molecular hydrogen (1 atm, toluene, 110 degrees C) gives the 92-electron hexanuclear hexahydrido derivative [Ru-6(mu-H)(6)(mu(3),eta(2)-ampy)(2)(CO)(14)] (2). This hexanuclear compound regenerates complex 1 when exposed to carbon monoxide. However, it undergoes CO substitution instead of ligand addition when treated with PR(3) to give [Ru-6(mu-H)(6)(mu(3),eta(2)-ampy)(2)(PR(3))(2)(CO)(12)] (R=4-tolyl (3a) or Ph (3b)). The X-ray diffraction structure of 3a indicates that it consists of two trinuclear fragments connected to each other through two bridging hydrides, and two weak metal-metal bonds. NMR experiments (H-1, C-13, homonuclear H-1 NOE, and heteronuclear indirect C-13-H-1 correlations) indicate that 2 is isostructural with 3a. Complex 2 is an efficient catalyst precursor for the homogeneous hydrogenation of unsaturated organic molecules. A kinetic analysis of the hydrogenation of diphenylacetylene under very mild conditions (T = 323 K, P(H-2) < 1 atm) has shown that the reaction is first-order in the concentration of 2, first-order in hydrogen pressure and zero-order in substrate concentration, suggesting that the active catalytic species are hexanuclear. [References: 45]
机译:48电子络合物[Ru-3(mu-H)(mu(3),eta(2)-ampy)(CO)(9)](1)的反应(Hampy = 2-amino-6-methylpyridine )与分子氢(1 atm,甲苯,110摄氏度)得到92电子六核六氢衍生物[Ru-6(mu-H)(6)(mu(3),eta(2)-ampy)(2) (CO)(14)](2)。当暴露于一氧化碳时,该六核化合物可再生配合物1。但是,当用PR(3)处理时,它会发生CO取代而不是配体添加,从而产生[Ru-6(mu-H)(6)(mu(3),eta(2)-ampy)(2)(PR( 3))(2)(CO)(12)](R = 4-甲苯基(3a)或Ph(3b))。 3a的X射线衍射结构表明,它由两个通过两个桥联氢化物和两个弱金属-金属键相互连接的三核碎片组成。 NMR实验(H-1,C-13,同核H-1 NOE和异核间接C-13-H-1相关性)表明2与3a是同构的。络合物2是用于不饱和有机分子的均相氢化的有效催化剂前体。在非常温和的条件下(T = 323 K,P(H-2)<1 atm)对二苯乙炔进行氢化反应的动力学分析表明,该反应在浓度为2,氢压和底物浓度为零阶,表明活性催化物质为六核。 [参考:45]

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