Substituent Influences on the NMR Signal Amplification of Ir Complexes with Heterocyclic Carbene Ligands

Substituent Influences on the NMR Signal Amplification of Ir Complexes with Heterocyclic Carbene Ligands
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取代基对杂环卡宾配体 Ir 配合物 NMR 信号放大的影响

DOI:
10.1007/s00723-019-01115-x
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发表时间:
2019
影响因子:
1
通讯作者:
G. Buntkowsky
G. Buntkowsky
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
S. Hadjiali;R. Savka;M. Plaumann;U. Bommerich;S. Bothe;T. Gutmann;T. Ratajczyk;J. Bernarding;H.-H. Limbach;H. Plenio;G. Buntkowsky

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本文制备了一些带有不对称n -杂环卡宾(NHC)配体的ir - n -杂环卡宾(Ir-NHC)配合物,并通过可逆交换(SABRE)对其信号放大进行了研究。以吡啶为模型化合物进行超极化实验。该底物在溶剂混合物中使用几种不同的NHC配体Ir-NHC配合物进行了检测。结果表明,不对称NHC配体由于其良好的化学性质,可以使SABRE活性配合物适应不同的化学环境。
A number of Ir–N-heterocyclic carbene (Ir–NHC) complexes with asymmetricN-heterocyclic carbene (NHC) ligands have been prepared and examined for signal amplification by reversible exchange (SABRE). Pyridine was chosen as model compound for hyperpolarization experiments. This substrate was examined in a solvent mixture using several Ir–NHC complexes, which differ in their NHC ligands. The SABRE polarization was created at 6 mT and the1H nuclear magnetic resonance signals were detected at 7 T. We show that asymmetric NHC ligands, because of their favorable chemistry, can adapt the SABRE active complexes to different chemical scenarios.
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