A very unusual situation occurs in a compound dubbed "inverse sodium hydride", which contains H and Na ions.  Na is an alkalide, and this compound differs from ordinary sodium hydride in having a much higher energy content due to the net displacement of two electrons from hydrogen to sodium.  A derivative of this "inverse sodium hydride" arises in the presence of the base [[adamanzane|[3]adamanzane]].  This molecule irreversibly encapsulates the H and shields it from interaction with the alkalide Na.  Theoretical work has suggested that even an unprotected protonated tertiary amine complexed with the sodium alkalide might be metastable under certain solvent conditions, though the barrier to reaction would be small and finding a suitable solvent might be difficult.