Nomenclature of complex compound (of inorganic chemistry) , WRITTEN BY AMIR HASSAN FROM GOVT. POST GRADUATE COLLAGE MARDAN, KPK, PAKISTAN.

1. Written BY : AMIR HASSAN OF BS CHEMISTRY DEPARTMENT GPGC MARDAN
EMAIL : AMIRHASSAN741@GMAIL.COM
NOMENCLATURE OF COMPLEX COMPOUND
1) First we can see generaltypes of complexes:
 Neutral Complexes:
[Ni(CO)4]0
 Anionic Complexes:
K+2
2 [Fe+2
(CN)4]-2
 Cationic Complexes:
[Pt+4
(NH3)4.NO2.Cl]+2
2) NOMENCLATURE RULES:
 The name of cation is written first, and then followed by anions in ionic complexes. (Like Na+
Cl-
i.e.
Sodium+
-Chloride-)
. E.g.
K+2
2 [Pt+4
(Cl)6]-2
: Potassium-Hexachloro-platinate(IV)
 The name of ligand is written first then followed by the name of metal (oxidation state).
[Pt+4
(NH3)6]+4
:Hexamine-platinum(IV)
 THE NATURE OF LIGANDS :-
 Negative Ligand: - with the negative ligand name “O” (ao), is added to its ends.
e.g. Cl-
as Chloro, Br-
as Bromo, I-
as Iodo, CN-
as Cyano
CH3COO-
Acetato, NO2
-
Nitroso
 Positive Ligand: - with the positive ligand name as “ium” is added to its ends.
e.g. NO+
as Nitosylium, and NH2-NH3
+
as Hydrazinium
 Neutral Ligand:- with the neutral name as such special name are written mean their own
Name is enough. e.ge.
(C2H5-as-Ethyl), (C5H12-as-Phenyl),(NH3-as-Amine), (H2O-as-Aquo)
 THE ODER OF LIGAND: - (NEGATIVE > NEUTRAL > POSITIVE)
the name of ligand are written in Oder form as negative first, then neutral-ligands, and lastly the
name of positive-ligand, in coordination sphere.
e.g. [Co+3
(NH3)4.Cl2]+1
Cl : Dichloro-Tetramine-Co (III)-Chloride
Note: IF more than One Similar charged Species/Ligand are present in coordination sphere. Then
arranged them in alphabetically Oder (i.e. A-C-D-E-F- and so On Up to Z).
e.g. [Co+3
(NH3)4.NO+
.Cl-
]+1
Cl : Chloro-Nitro-Tetramine-Co (III)-Chloride
 THE NUMBER OF LIGANDS: - The number of ligands are written as
Bi= Two, Tri=Three, Tetra=Four, Penta=Five, and so on.