期刊
DALTON TRANSACTIONS
卷 44, 期 3, 页码 1077-1083出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4dt03088e
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资金
- Spanish MEC Consolider Ingenio research programme [2010-ORFEO-CSD2007-00006]
- EPSRC [EP/F022530/1, EP/G009546/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G009546/1, EP/H029575/1, EP/F022530/1, GR/S23605/01] Funding Source: researchfish
The short lived pincer complex [(C5H3N(CH2P(Bu-t)(2))(2))Ir(H)(2)(py)]BF4 is shown to be active for signal amplification by reversible exchange. This catalyst formulation enables the efficient transfer of polarization from parahydrogen to be placed into just a single molecule of the hyperpolarisation target, pyridine. When the catalysts H-1 nuclei are replaced by H-2, increased levels of substrate hyperpolarization result and when the reverse situation is examined the catalyst itself is clearly visible through hyperpolarised signals. The ligand exchange pathways of [(C5H3N(CH2P(Bu-t)(2))(2))Ir(H)(2)(py)]BF4 that are associated with this process are shown to involve the formation of 16-electron [(C5H3N(CH2P(Bu-t)(2))(2))Ir(H)(2)(py)]BF4 and the 18-electron H-2 addition product [(C5H3N(CH2P(Bu-t)(2))(2))Ir(H)(2)(py)]BF4.
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