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2篇 您的检索式:作者名="Iskander Douair"
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1Dinitrogen cleavage and hydrogenation to ammonia with a uranium complex显示文摘The Haber-Bosch process produces ammonia(NH_(3))from dinitrogen(N_(2))and dihydrogen(H_(2)),but re quires high temperature and pressure.Before iron-based catalysts were exploited in the current industrial Haber-Bosch process,uranium-based materials served as effective catalysts for production of NH_(3)from N_(2).Although some molecular uranium complexes are known to be capable of combining with N_(2),further hydrogenation with H_(2)forming NH_(3)has not been reported to date.Here,we describe the first example of N_(2)cleavage and hydrogenation with H_(2)to NH_(3)with a molecular uranium complex.The N_(2)cleavage product contains three uranium centers that are bridged by three imido μ_(2)-NH ligands and one nitrido μ_(3)-N ligand.Labeling experiments with^(15)N demonstrate that the nitrido ligand in the product originates from N_(2).Reaction of the N_(2)-cleaved complex with H_(2)or H^(+)forms NH_(3)under mild conditions.A synthetic cycle has been established by the reaction of the N_(2)-cleaved complex with trimethylsilyl chloride.The isolation of this trinuclear imido-nitrido product implies that a multi-metallic uranium assembly plays an important role in the activation of N_(2).Xiaoqing Xin Iskander Douair Yue Zhao Shuao Wang Laurent Maron Congqing Zhu 2023National Science Review2023,10,2:0
2Uranium(Ⅲ)–Phosphorus(Ⅲ) Synergistic Activation of White Phosphorus and Arsenic显示文摘The study of small-molecule activation by f-block elements still lags far behind that of transition metals.Although a few uranium complexes have been reported to activate dinitrogen,reports on the activation of heavier congeners,such as white phosphorus(P_(4)),by uranium species are extremely rare,and no example of uranium-mediated activation of elemental arsenic has appeared.Wei Fang Iskander Douair Adrian Hauser Kai Li Yue Zhao Peter WRoesky Shuao Wang Laurent Maron Congqing Zhu 2022CCS Chemistry2022,4,8:0
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