Strong P-31 nuclear spin hyperpolarization produced via reversible chemical interaction with parahydrogen

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.