Base-Free Reversible Hydrogen Storage Using a Tethered π-Coordinated-Phenoxy Ruthenium-Dimer Precatalyst

A dimeric tethered π-coordinated-phenoxy ruthenium precatalyst has been used for the base-free hydrogenation of CO2 in DMSO. The same precatalyst was also efficient in the reverse dehydrogenation of formic acid yet under base-free conditions. An unprecedented base-free cycle consisting in hydrogen storage and release was successfully implemented with the same precatalyst. The latent property of the catalyst has been introduced in the concept of hydrogen storage/transportation/release.