Coordination complex
molecule or ion containing ligands datively bonded to a central metallic atom
A coordination complex is an inorganic chemical compound where a central atom (usually a metal) has an electron shell which permits it to combine with one or more molecules. These molecules, called ligands, have at least one pair of free electrons for binding.
![](http://up.wiki.x.io/wikipedia/commons/thumb/9/96/Cisplatin-3D-balls.png/200px-Cisplatin-3D-balls.png)
A platinum atom with four ligands
![](http://up.wiki.x.io/wikipedia/commons/thumb/a/aa/Grubbs-1G-3D-balls.png/220px-Grubbs-1G-3D-balls.png)