Following rules are followed for naming coordination compounds recommended by IUPAC :

1. In case of a complexion or a neutral molecule, name the ligand first and then the metal.

2. The names of anionic ligands are obtained by changing the ending -ide to -o and -ate to -ato.

3. The name of a complex is one single word. There must not be any space between different ligand names as well as between ligand name and the name of the metal.

4. After the name of the metal, write its oxidation state in Roman number which appears in parentheses without any space between metal name and parentheses.

5. If complex has more than one ligand of the same type, the number is indicated with prefixes, di-, tri-, tetra-, penta-, hexa- and so on. 

6. For the complex having more than one type of ligands, they are written in an alphabetical order. Suppose two ligands with prefixes are tetraaqua and dichloro. While naming in alphabetical order, tetraaqua is written first and then dichloro. 

7. If the ligand itself contains numerical prefix in its name, then display number by prefixes bis for 2, tris for 3, tetrakis for 4 and so forth. Put the ligand name in parentheses. 

For example, 

(ethylenediamine)3 or (en)3 would appear as tris (ethylenediamine) or tris(ethane-l, 2-diamine). 

8. The metal in cationic or neutral complex is specified by its usual name while in the anionic complex the name of metal ends with 'ate'.