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A Molecular Barium Hydrido Complex Stabilized by a Super-Bulky Hydrotris(pyrazolyl)borate Ligand
Xianghui Shi1, Cuiping Hou1,2, Chulu Zhou1,2
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625, Renmin Street, Changchun, 130022, China.
Abstract:
Hydrogenolysis of the scorpionate-supported barium alkyl complex (TpAd,iPr )Ba[CH(SiMe3 )2 ](THF) (TpAd,iPr =hydrotris(3-adamantyl-5-isopropyl-pyrazolyl)borate) afforded the dinuclear barium hydrido complex [(TpAd,iPr )Ba(μ-H)]2 (2), which was characterized by NMR spectroscopy and single-crystal X-ray analysis. Exposure of 2 with 1 atm of CO resulted in a reductive coupling process to form the cis-ethendiolate dianion (3). Reaction of 2 with one equivalent of PhC≡C-C≡CPh gave barium 1,4-diphenyl-2-butyne-1,4-diyl complex {[(TpAd,iPr )Ba]2 (PhCH-C≡C-CHPh) (4).
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