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摘要
Starting from the novel chlorido precursor trans-[RuCl2(IMe)(4)] (1, IMe = 1,3,4,5-tetramethylimidazol-2-ylidene), hydridoruthenium complexes trans-[RuH2(IMe)(4)] (2) and [RuH(IMe)(4)][BEt4] (3BEt(4)) have been synthesized. Complex 2 was isolated from the reaction of I with LiAlH4, while ionic compound 3 was obtained when LiBHEt3 was used as the hydride source. Complexes 1-3 have been characterized by Xray crystallography, multinuclear NMR, IR, UV/Vis spectroscopy and mass spectrometry. Neutral dihydride 2 displays a tetragonal bipyramidal geometry with four carbene groups coordinated to ruthenium in equatorial positions and two apical hydrogen atoms. DFT calculations Suggest that the trans structure observed for 2 is preferred over a cis arrangement for steric reasons. The ruthenium atom of 3 has a tetragonal pyramidal coordination environment with a vacant coordination site sterically protected by the Me substituents of the ligands. Thus, compound 3 should be an attractive target for future coordination studies.
- 出版日期2010-2
