Fine-tuning the efficiency of para-hydrogen-induced hyperpolarization by rational N-heterocyclic carbene design
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![Fig. 2 NHC identity in the precatalyst [IrCl(COD)(NHC)] 2-22. Variations in the functional groups in the ortho (red), meta (orange), para (blue) and imidazole (green) positions give access to a diverse range of electronic and steric properties](https://thumb-us.123doks.com/thumbv2/123dok_us/1956044.156148/4.892.176.719.72.527/identity-precatalyst-variations-functional-imidazole-positions-electronic-properties.webp)
![Fig. 4 Relaxation effects and SABRE performance of catalysts 1−21. a T 1 relaxation times for H-2 (solid block) and H-5 (dashed) of free A (1 eq.) when present with [Ir(H) 2 (NHC)(A) 3 ]Cl (5 mM) and 3 bar H 2 in methanol-d 4 at 9.4 T](https://thumb-us.123doks.com/thumbv2/123dok_us/1956044.156148/6.892.86.815.825.1037/relaxation-effects-performance-catalysts-relaxation-dashed-present-methanol.webp)
![Fig. 6 Expanding the substrate scope. Polarization transfer performance for the indicated precatalyst [IrCl(COD)(NHC)] (5 mM) and substrate B–F (4 eq.) in methanol-d 4 under 3 bar p-H 2 as protio (yellow), deuterio (green) and 1 (grey)](https://thumb-us.123doks.com/thumbv2/123dok_us/1956044.156148/8.892.69.431.776.1026/expanding-substrate-polarization-performance-indicated-precatalyst-substrate-deuterio.webp)
![Fig. 7 Heteronuclear SABRE hyperpolarization. a 15 N NMR spectra of pyridine- 15 N (25 mM) achieved with indicated [IrCl(COD)(NHC)] (2.5 mM)](https://thumb-us.123doks.com/thumbv2/123dok_us/1956044.156148/9.892.177.715.79.478/heteronuclear-sabre-hyperpolarization-spectra-pyridine-achieved-indicated-ircl.webp)
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