9. If the complex ion is a cation, the metal is named same as the element.
10. The neutral complex molecule is named similar to that of the complex cation.
Some examples are( i) [ Cr( NH3) 3( H2O) 3 ] Cl3 triamminetrichlorochromium( III) chloride
( ii) [ Co( H2CH2CH2H2) 3 ] 2( SO4) 3 tris( ethane-l, 2-diamine) cobalt( III) sulphate
( iii) [ Ag( NH3) 2 ] [ Ag( CN) 2 ] diamminesilver( I) dicyanoargentate( I)
( iv) K4 [ Fe( CN) 6 ] potassium hexacyanoferrate( II)
Isomerism in Coordination Compounds Coordination compounds exhibit the following types of isomerism: 1. Structural Isomerism
In this isomerism. isomers have different bonding pattern. Different types of structural isomers are
( i) Linkage isomerism This type of isomerism is shown by the coordination compounds having ambidentate ligands. e. g.,
[ Co( NH3) 5( NO2)] Cl and [ Co( NH3) 5( ONO)] Cl or pentaammine nitrito- N Cobalt( III) chloride and pentaammine nitrito-O’ Cobalt( III) chloride.
( ii) Coordination isomerism This type of isomerism arises from the interchange of ligands between cationic and anionic complexes of different metal ions present in a complex, e. g.,
[ Cr( NH3) 6) [ CO( CN) 6 ] and [ CO( NH3) 6 ] [ Cr( CN) 6 ]