CH1012
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NAMING COMPLEXES V
Numerical prefixes.  
• The occurrence of two or more ligands (or metal atoms) is indicated by the prefixes di, tri, tetra, penta or hexa
• For polysyllabic organic bi-/multi- dentate ligands and/or ligands containing di, tri etc then bis (2) and tris(3) are used to reduce confusion with the naming inside the ligand (which will be di, tri ...).
 eg. [Ni(en)2]Cl2              (en = NH2CH2CH2NH2) bis(ethylenediamine)nickel(II) chloride