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Water exists in two forms, para and ortho, that have nuclear spin states withdifferent symmetries. Here we report the conversion of fullerene-encapsulatedpara-water to ortho-water. The enrichment of para-water at low temperatures ismonitored via changes in the electrical polarizability of the material. Uponrapid dissolution of the material in toluene the excess para-water converts toortho- water. In H$_2{}^{16}$O@C$_{60}$ the conversion leads to a slow increasein the NMR signal. In H$_2{}^{16}$O@C$_{60}$ the conversion gives rise to weaksignal enhancements attributed to quantum-rotor-induced nuclear spinpolarization. The time constants for the spin-isomer conversion offullerene-encapsulated water in ambient temperature solution are estimated as30$\pm$4 s for the $^{16}$O-isotopologue of water, and 16$\pm$3 s for the$^{17}$O isotopologue.

Spin-isomer conversion of water at room temperature, and quantum-rotor-induced nuclear polarization, in the water-endofullerene H$_2$O@C$_{60}$