4.7 Article

The reaction of an iridium PNP complex with parahydrogen facilitates polarisation transfer without chemical change

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

  1. Spanish MEC Consolider Ingenio research programme [2010-ORFEO-CSD2007-00006]
  2. EPSRC [EP/F022530/1, EP/G009546/1] Funding Source: UKRI
  3. Engineering and Physical Sciences Research Council [EP/G009546/1, EP/H029575/1, EP/F022530/1, GR/S23605/01] Funding Source: researchfish

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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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