Fig. 2. SABRE hyperpolarisation of 2,5-lutidine via precursor [IrCl(COD)(IMes)] and the co-ligand DMSO-d6 in dichloromethane-d2 solution. (a) Schematic of formation of complexes [IrCl(H)2(IMes)(DMSO-d6)2] and [IrCl(H)2(IMes)(DMSO-d6)(2,5-lutidine)]. (b) SABRE hyperpolarised 1H NMR spectrum of 2,5-lutidine after polarisation transfer at 70 G with 3 bar p-H2 and detection using a 90° flip angle. (c) PHIP enhanced hydride region of the hyperpolarised 1H NMR spectrum collected using a 45° flip angle.
