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- W2332955151 abstract "Nickel pincer complexes of the type [2,6-(R2PO)2C6H3]NiH (R = tBu, 1a; R = iPr, 1b; R = cPe, 1c) react with BH3·THF to produce borohydride complexes [2,6-(R2PO)2C6H3]Ni(η2-BH4) (2a–c), as confirmed by NMR and IR spectroscopy, X-ray crystallography, and elemental analysis. The reactions are irreversible at room temperature but reversible at 60 °C. Compound 1a exchanges its hydrogen on the nickel with the borane hydrogen of 9-BBN or HBcat, but does not form any observable adduct. The less bulky hydride complexes 1b and 1c, however, yield nickel dihydridoborate complexes reversibly at room temperature when mixed with 9-BBN and HBcat. The dihydridoborate ligand in these complexes adopts an η2-coordination mode, as suggested by IR spectroscopy and X-ray crystallography. Under the catalytic influence of 1a–c, reduction of CO2 leads to the methoxide level when 9-BBN or HBcat is employed as the reducing agent. The best catalyst, 1a, involves bulky substituents on the phosphorus donor atoms. Catalytic reactions involving 1b and 1c are less efficient because of the formation of dihydridoborate complexes as the dormant species as well as partial decomposition of the catalysts by the boranes." @default.
- W2332955151 created "2016-06-24" @default.
- W2332955151 creator A5019741940 @default.
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- W2332955151 creator A5073501391 @default.
- W2332955151 date "2012-05-16" @default.
- W2332955151 modified "2023-09-25" @default.
- W2332955151 title "Pincer-Ligated Nickel Hydridoborate Complexes: the Dormant Species in Catalytic Reduction of Carbon Dioxide with Boranes" @default.
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- W2332955151 doi "https://doi.org/10.1021/ic300587b" @default.
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