Coordination complex

molecule or ion containing ligands datively bonded to a central atom, which is usually metallic
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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.

Cisplatin, PtCl2(NH3)2
A platinum atom with four ligands
Grubbs' catalyst, another example of a chemical complex.