Nomen clature:-

Rule 1:- Cation is always named first either it is normal cation or complex.

Rule 2:- In naming of complex part, legands are alphabetically arranged before name of metal. and for naming of metal there are two possibilities.

1. If  complex  is  neutral  or cationic, common name of metal is used.
2. But if complex is anionic normal name of metal ended with ate is applied.  

   After name of metal, its oxidation state is represented in a small bracket in a roman numeric value.

Rule 3:- If name of legand either itself include di, tri, bis term or its mane is complicated then Bis, tris, terms are used.

(en)₂ --> Bis (ethylene diamine)

(Py)₂ --> Bis (pyridine)

Rule 4:- In case of bridge complexes, bridged legands are separated with greek letter μ.

eg:- Neutral:-

[Ni (CO)₄ ] -->Tetra Carbonyl nickel (o)

[Fe (CO)₅ ] -->Penta Carbonyl Iron (o)

[Cr (NH₃)₃ Cl₃] --> Tri ammine tri chloride chromium III

[Ni (dmg)₂ ] --> Bis (dimethyl glyoxomato) nickel  II

Cationic:- [Fe (NH₃)₄ (H₂O)₂ ] Cl₂

Tetra ammine di aqua iron (II) chloride.

[Cr (en)₂ (H₂O) (Br)]SO₄

Aqua Bromido bis (ethylene di amine) chromium (III) Sulphate dihydrate.

Anionic:-

• K₄ [Fe (CN)₆]

Pottassium hexa cyano ferrate II

Or

Tetra potassium hexa cyano ferrate

• Na₂ [Fe (CN)₅ (NO) ]

Sodium nitroprusside :-

Sodium penta cyano nitrosylium Ferrate II

Cationic Anionic Both:-

1. [Fe (NH₃)₄ ] [ Cucl₄ ]^-2

Tetra aqua Iron (III) - amido– Hydroxo

Tetra ammine (III) sulphate

2. [ Fe (NH₃)₆ ] [ CoF₆]

Tetra ammine iron III – – amido – hydroxy

Tetra ammine iron (III) sulphate

Or

Bis (Tetra ammine) – μ – amido – μ hydroxy iron (III) sulphate