Dinuclear polyhydrides of rhenium: isolation and characterization of diamagnetic and paramagnetic complexes containing the octahydrodirhenium(n+) (Re2H8n+), heptahydrodirhenium((n + 1)+) (Re2H7(n+1)+), and pentahydrodirhenium((n + 1)+) (Re2H5(n+1)+) cores (n = 0 or 1) stabilized by phosphine, nitrile, and isocyanide ligands | Synapse