Recent advances in hydrogen bonding studies involving metal hydrides

Neutral transition metal hydrides tend to act as proton acceptors towards conventional H-bond proton donors. The resulting species can be precursors of dihydrogen complexes. The BH bonds of boranes are also effective H-bond acceptors. Cationic metal hydrides, in contrast, can act as proton donors toward conventional H-bond acceptors, such as OPPh3.