Harnessing asymmetric N-heterocyclic carbene ligands to optimise SABRE hyperpolarisation

Wong Chin Min; Fekete Marianna; Nelson-Forde RhiannaGatus Mark R. D.Rayner Peter J.Whitwood Adrian C.Duckett Simon B.Messerle Barbara A.

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Harnessing asymmetric N-heterocyclic carbene ligands to optimise SABRE hyperpolarisation

机译：利用不对称氮杂卡宾配体来优化SABRE hyperpolarisation

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The catalytic signal amplification by reversible exchange process has become widely used for the hyperpolarisation of small molecules to improve their magnetic resonance detectability. It harnesses the latent polarisation of parahydrogen, and involves the formation of a labile metal complex that often contains an N-heterocyclic carbene (NHC) ligand (e.g. [Ir(H)(2)(NHC)(pyridine)(3)]Cl), which act as a polarisation transfer catalyst. Unfortunately, if the target molecule is too bulky, binding to the catalyst is poor and the hyperpolarisation yield is therefore low. We illustrate here the behaviour of a series of asymmetric NHC containing catalysts towards 3,4- and 3,5-lutidine in order to show how catalyst design can be used to dramatically improve the outcome of this catalytic process for sterically encumbered ligands.

机译：可逆催化信号放大交换过程已成为广泛使用的hyperpolarisation小分子的改善他们的核磁共振检测能力。利用潜在的分化仲氢,涉及的形成不稳定的金属复杂,通常包含一个氮杂卡宾(NHC)配体(如。(红外(H) (2) (NHC)(吡啶)(3)]Cl),作为一个两极分化转移催化剂。目标分子太笨重,绑定的催化剂是贫穷和hyperpolarisation收益率因此低。一系列不对称NHC的行为含有催化剂对3、4,3, 5-lutidine为了说明催化剂的设计可以显著改善结果sterically的催化过程的配体。

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来源
《Catalysis science & technology》 |2018年第19期|4925-4933|共9页
作者
Wong Chin Min; Fekete Marianna; Nelson-Forde RhiannaGatus Mark R. D.Rayner Peter J.Whitwood Adrian C.Duckett Simon B.Messerle Barbara A.;
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作者单位

Univ New South Wales, Sch Chem, Sydney, NSW 2052, Australia;

Macquarie Univ, Dept Mol Sci, N Ryde, NSW 2109, Australia;

Univ York, Ctr Hyperpolarisat Magnet Resonance, York Sci Pk, York YO10 5NY, N Yorkshire, England;

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正文语种英语
中图分类汉语教学;
关键词
signal amplification; parahydrogen; Metal complexeshyperpolarizationTelescoping a seriesPolarizationCatalystscarbenesmall moleculeRemainder of a Series;

机译：信号放大;仲氢金属complexeshyperpolarizationTelescoping一seriesPolarizationCatalystscarbenesmallmoleculeRemainder一系列;

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Harnessing asymmetric N-heterocyclic carbene ligands to optimise SABRE hyperpolarisation

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