Add time:09/01/2019         Source:sciencedirect.com

The dimeric hydride [Cp′2SmH]2 and the monomeric trisalkylborohydride Cp′2SmHBEt3(THF)n (Cp′  C5H4tBu) are obtained from the starting dimeric chloride [Cp′2SmCl]2 by reaction with a hydridic reagent: NaHBEt3. By hydrogenolysis of Cp′2SmR (R  CH2SiMe3 or CH(SiMe3)2) in the presence of an ancillary ligand as PMe3, a monomeric hydride: Cp′2SmH(PMe3)2 is formed.The trisalkylborohydride is fairly stable in solution when other new hydrides are only moderately stable: upon standing at room temperature, an irreversible transformation into Cp′3Sm is observed. All hydrideds react with propanone to give the corresponding alkoxide: [Cp′2SmOCHMe2]2.The new alkyl complex [Cp′2SmMe]2 is isolated and characterized by NMR and elemental analysis. After hydrogenolysis of this dimer or by reaction of one equivalent of NaHBEt3 with the dimer [Cp′2SmCl]2, mixed bridged hydrides of the general formula Cp′2Sm(μ−H)(μ−X)SmCp′2 (X  Me or Cl) are formed. A mixed bridged chloroalkoxy complex Cp′2Sm(μ-OCHR2)(μ-Cl)SmCp′2 is also obtained.

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