Representative SABRE hyperpolarized1H NMR spectrum when1(5 mM) andA(25 mM) are shaken with 3 barpH2for 10 s atca6.5 mT in methanol-d4. Resonances marked with filled shapes refer to sites in freeA, whereas outline shapes indicate the analogous site bound in [IrCl(H)2(IMes)(A)2]. Resonances for freeAare broadened due to exchange with the metal center, and the effect is more pronounced when lower ligand excesses relative to Ir are used.
