|Class 12 Chemistry Coordination Compounds||Nomenclature of coordination compounds|
Nomenclature of coordination compounds
Like for ionic compounds the naming is done by writing first cation name and then naming anion.
For example: NaCl is ionic and written as sodium chloride that is in name first part is cationic and other is anionic.
In the same way coordination compounds consist of two parts:Cation and anion. While naming,the name of cationic part is written first followed by anionic part. There are certain set of rules that are followed while writing name of cation.
Naming for cationic species: in which coordination sphere is positively charged
Let’s say the coordination sphere is cationic that is with positive charge for example [Co (NH3)6] Cl3 for the naming of coordination entity is done first and later the counter ion .so in given complex the name of [Co (NH3)6] is written first than the counter ion Cl
For example: in complex [Co (NH3)5CL] the name of ligands is written in alphabetical order that is for ammine firstand then chloro.
Rules for writing the name of the ligand:
Like for oxalate it is written as oxalate, sulphite as sulphito
Example for chloride it becomes chlorido
For example: in complex [Co (NH3)6] ligand name will be hexamine that is hexa for 6
For example: [CoCl2(en)2] Cl in this the ligands are dichlorobisethylenediamine
In case of Central metal atom:
Oxidation state of central metal atom is written in numeral after the name of central metal atom
For example: in complex [Co (NH3)6] Cl3 it is hexamine cobalt (III) that is cobalt (III) is central metal atom with its Oxidation state in numeral
for example: in complex K3[fe(CN)6] in this the name is written as potassium hexacyanoferrate(III) that is in this example coordination entity is anionic complex and the name of central metal atom is written with ate followed by Oxidation state in numeral
some commonly used ligands:
some examples of iupac naming: