Substantial P-31 NMR signal enhancement of more than two orders of magnitude at 7 T for free and bound PPh3 species was observed under reversible interaction of (PPh3)(3)Ir(H-2)Cl with parahydrogen. The large improvement in sensitivity made single-shot P-31 NMR imaging of a model object possible. The observed effects are temperature and magnetic field dependent as shown experimentally and theoretically.
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