Complex hydrides: In these hydrides, the hydride ion (H–) acts as the ligand and is attached to the central metal atom by coordinate bonds. These are formed both by transition elements and non-transition elements. Among the non-transition elements, the most important complex hydrides are formed by elements of group 13. These are sodium borohydride (NaBH4), lithium borohydride (LiBH4) and lithium aluminium hydride (LiAlH4). These are versatile reducing agents and are widely used for reduction of organic compounds.
