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- W2149190015 abstract "Hydrogen, the simplest element in the periodic table, plays a tremendous role in organic and inorganic chemistry. For years, it was inconceivable that dihydrogen could be bound to a metal center without breaking the H-H bond. Thus, oxidative addition of H(2) was universally recognized as a key elementary step in hydrogenation processes. In 1984, Kubas and co-workers reported the first example of a complex in which dihydrogen was coordinated to a metal center without breaking of the H-H bond. This opened a new area in coordination chemistry: sigma-complexes were born, complementing the well-known Werner-type family of complexes. Since then, hundreds of stable dihydrogen complexes have been isolated, and their properties have been investigated in detail. By comparison, very little information is available for the analogous class of sigma-borane complexes, in which sigma-H-B bonds are complexed to a metal (in the manner of H-H bonds in sigma-dihydrogen complexes). Since the first example published in 1996 by Hartwig and co-workers, very few sigma-borane complexes have been isolated. Scientists have maintained a continuous interest in catalytic hydrogenation reactions. Almost a century ago, in 1912, Paul Sabatier, the father of the hydrogenation process, received the Nobel prize, and the selection of Noyori and Knowles in 2001 for their studies on enantioselective catalyzed hydrogenations amply demonstrates the ongoing importance of the field. Moreover, during the past decade, dihydrogen has attracted considerable attention as a possible fuel of the future. This endeavor has furthered interest in sigma-borane complexes, as more and more evidence links their chemistry to that of amine-borane derivatives. Indeed, ammonia-borane (NH(3)BH(3)) is attracting significant interest for hydrogen storage applications. One of the main limitations is the lack of reversibility associated with the production of dehydrogenated (BNH)(x) materials. Of major importance will be a better understanding of the coordination of H(2) to a metal center, and more generally of the coordination of H-E bonds (E = B, C), which are likely to play a critical role in the reversible dehydrogenation process. In this Account, we review our recent results in the field of dihydrogen and borane activation, with a specific focus on the problem of reversible dehydrogenation pathways. We concentrate on the chemistry of ruthenium complexes incorporating two sigma-ligands: either two dihydrogen or two sigma-B-H bonds. We describe our synthetic strategies to prepare such unusual structures. Their characterization is discussed in detail, highlighting the importance of an experimental and theoretical approach (NMR, structural, and theoretical studies). Some catalytic applications are discussed and put into context, and their reactivity toward reversible hydrogen release is detailed." @default.
- W2149190015 created "2016-06-24" @default.
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- W2149190015 creator A5054046860 @default.
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- W2149190015 date "2009-07-08" @default.
- W2149190015 modified "2023-10-17" @default.
- W2149190015 title "Bis σ-Bond Dihydrogen and Borane Ruthenium Complexes: Bonding Nature, Catalytic Applications, and Reversible Hydrogen Release" @default.
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- W2149190015 doi "https://doi.org/10.1021/ar900091a" @default.
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