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a) The overall schematic of SABRE hyperpolarization of 15N. Spin order is transferred from para-H2 and mediated by scalar spin-spin couplings within a reversibly-formed Ir-IMes hexacoordinate complex.23, 26 Direct SABRE of short-range 15N sites is accomplished via 2-bond couplings between 15N and hydride protons.17–18 b) the molecular framework (note axial ligangd of polarization transfer from hydride protons via short- and long-range spin-spin (J) couplings.
