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A stepwise strategy to form tris(bidentate)-Osmium(II) complexes enclosing three different bidentate ligands

AuthorsBolaño, Tamara ; Esteruelas, Miguel A. ; Oñate, Enrique ; Palacios, Adrián ; Tsai, Jui-Yi; Xia, Sean
Issue Date2014
CitationVII International School on Organometallic Chemistry “Marcial Moreno Mañas” (2014)
AbstractThe cleanest synthetic strategy for the preparation of M–NHC complexes (M = transition metal) is the direct metalation. This method requires the presence at the starting complex of a strong Brønsted base as ligand, which becomes labile by deprotonating the imidazolium salt. Neutral transition-metal polyhydride complexes are basic enough to produce this deprotonation. In addition, the complex OsH6(PiPr3)2 has demonstrated to activate σ bonds of a wide range of organic molecules.1 In the light of these precedents, we reacted this hexahydride with N-heterocyclic carbenes in order to obtain the corresponding neutral trihydride derivatives OsH3(C,C'–L)(PiPr3)2 (C is referred to ortho-metalated phenyl carbon atom; C' to N-heterocyclic carbene carbon atom; L to chelate NHC ligand). Protonation of the formed trihydrides with tetrafluoroboric acid leads to the formation of the corresponding cationic bis(dihydrogen) derivatives [Os(C,C'–L)(μ2–H2)2(PiPr3)2]BF4. Herewith, we show how these novel bis(dihydrogen) complexes act as precursors for the formation of tris(bidentate)-osmium(II) derivatives, enclosing bidentate ligands as acetylacetonate (acac) and cis-1,2-bis(diphenylphosphino)ethylene (bdppe).
DescriptionTrabajo presentado al VII International School on Organometallic Chemistry “Marcial Moreno Mañas” celebrado en el Campus of the Universitat Autònoma de Barcelona (UAB) del 25 al 27 de junio de 2014.
Appears in Collections:(ISQCH) Comunicaciones congresos
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