What is the Uses of numerical prefixes

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Use of numerical prefixes :-






(1) :- when several ligands of the same type are present , prefixes di , tri , tetra , Penta , etc . Generally used to indicate the number of that kind of ligands . For example , for ammonia molecules it is named as diammine , for 3 ammonia it is named as tri ammine .

(2):- Where the last letter of the prefix and the first letter of the ligands name or when last letter of one ligands name and first letter of of next Ligands name or when last letter of a ligands name and first letter of the central metal atom or ions are same then both the letter are retained . For example tetra ammine , hexa ammine , Here both (a) are retained.

(3) :- When there are more than one poly dentate ligands or ligand of the organic species of the same kind  then prefixes like bis , tri ,tetrakis , etc . Are used in instead of tetra , tri , di , etc respectively . 

Example :

(A) - In case of organic ligands like methyl amine , ethyl ammine , etc prefixes like bis, tris , tetrakis etc are used as the use of prefixes like di , tri , etc  may lead to ambiguity . For example , bis ethyl amines (C2 H5 NH2 ) is different from the Diethyl ammine (C2H5 - NH - C2 H5 ) .

(B) :- when there are two ethylene diammine molecules present in the complex ion , it is written as bis (ethylene diammine).

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