Organometallic chemistry - Hydrogen ligand and corresponding derivatives

The hydrogen atom has only one electron. On the other hand, the H anion ^- has a doublet. We can therefore expect it to play the role of ligand, especially as the comparative electronegativities of transition metals and dihydrogen place the negative charge of the metal-hydrogen bond on the hydrogen atom.

This is worth discussing, as experience shows that substitution by this ion is possible. The reasoning will be extended to the hydrogen molecule and its double bond.

If it's the dihydrogen molecule that reacts, it's an oxidative addition reaction. If, on the other hand, the H ^- ion enters the reaction, it will act as a substituent for a doublet-carrying ion or molecule. The resulting derivatives will also be discussed in this article.