Transition metal hydride

Transition metal hydrides are chemical compounds containing a transition metal bonded to hydrogen. Most transition metals form hydride complexes and some are significant in various catalytic and synthetic reactions. The term "hydride" is used loosely: some so-called hydrides are acidic (e.g., H₂Fe(CO)₄), whereas some others are hydridic, having H-like character (e.g., ZnH₂).