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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The reaction of an iridium PNP complex with parahydrogen facilitates polarisation transfer without chemical change
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The reaction of an iridium PNP complex with parahydrogen facilitates polarisation transfer without chemical change

机译:铱PNP配合物与对氢的反应可促进极化转移,而无需化学变化

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摘要

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.
机译:短暂的钳夹复合物[(C5H3N(CH2P(Bu-t)(2))(2))Ir(H)(2)(py)] BF4对于通过可逆交换放大信号具有活性。该催化剂配方能够将极性从对氢的有效转移转移到超极化靶标吡啶的单个分子中。当催化剂H-1的原子核被H-2取代时,会导致底物超极化水平升高,并且当检查相反的情况时,通过超极化信号可以清楚地看到催化剂本身。与该过程相关的[(C5H3N(CH2P(Bu-t)(2))(2))Ir(H)(2)(py)] BF4的配体交换路径显示涉及16-电子[(C5H3N(CH2P(Bu-t)(2))(2))Ir(H)(2)(py)] BF4和18电子H-2加成产物[(C5H3N(CH2P(Bu-t) )(2))(2))Ir(H)(2)(py)] BF4。

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