We obtained a kerosene-soluble form of the lithium salt [UO2(O-2)(OH)(2)](24) phase (Li-U-24), by adding cetyltrimethylammonium bromide surfactant to aqueous Li-U-24. Interestingly, its variable-temperature solution 7Li NMR spectroscopy resolves two narrowly spaced resonances down to 10 degrees C, which shift upfield with increasing temperature, and finally coalesce at temperatures > 85 degrees C. Comparison with solid-state NMR demonstrates that the Li dynamics in the Li-U24CTA phase involves only exchange between different local encapsulated environments. This behavior is distinct from the rapid Li exchange dynamics observed between encapsulated and external Li environments for Li-U-24 in both the aqueous and the solidstate phases. Density functional theory calculations suggest that the two experimental Li-7 NMR chemical shifts are due to Li cations coordinated within the square and hexagonal faces of the U-24 cage, and they can undergo exchange within the confined environment, as the solution is heated. Very different than U-24 in aqueous media, there is no evidence that the Li cations exit the cage, and therefore, this represents a truly confined space.