A coordination compound is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds.
- Ligands are Lewis bases - they contain at least one pair of electrons to donate to a metal atom/ion. Ligands are also called complexing agents
- Metal atoms/ions are Lewis acids - they can accept pairs of electrons from Lewis bases.
eg. [Ni(NH3)6]2+ , [Zn(CN)4]2-