SABRE hyperpolarization. Parahydrogen (pH2), Ir-catalyst, cosubstrate (1-methyl-1,2,3-triazole, mtz), and analytes are involved in a reversible binding equilibrium. During the lifetime of the complex, the spin order of pH2 is converted to nuclear hyperpolarization in analytes.[7] Polarization transfer is conducted at low field outside the NMR magnet, after which the sample is inserted into the spectrometer for detection. An excess of mtz is needed for sub-millimolar SABRE to restore catalyst activity at low analyte concentrations.[13]
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