List various types of isomerism possible for coordination compounds, giving an example of each.
Isomerism in coordination compounds is mainly of two types: 1.Structural isomerism2.Stereo isomerism (a)Linkage isomerism (a)Geometrical isomerism (b)Coordination isomerism(b)Optical isomerism (c)Ionization isomerism (d)Solvate isomerism Examples: 1. (a) Linkage isomerism: (i) [Co(NH3)5NO2]Cl2 and [Co(NH3)5ONO]Cl2 (ii) [Mn(CO)5SCN] and [Mn(CO)5NCS] (b) Coordination isomerism: (I) [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6] (c) Ionization isomerism: (i) [Co(NH3)5SO4] Br and [Co(NH3)5Br]SO4 (d) Solvate isomerism: (i) [Cr(H2O)6]Cl3 (violet) and [Cr(H2O)5Cl]Cl2 H2O (grey−green) 2.(a) Geometrical isomerism: (i) Cis - and trans-isomers of [CoCl2(en)2]  (b) Optical isomerism (i) dextro- and laevo-rotatory forms of [Co(en)3]3+ 
