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9.8     List various types of isomerism possible for coordination compounds, giving an example of each.

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Two main types of isomerism are known in case of coordination compounds which can be further divided into subgroups:- 

  (a) Stereoisomerism   :- 

        (i)  Geometrical isomerism   E.g

                                                              .  

        (ii)  Optical isomerism 

                                                   

  (b)  Structural isomerism :- 

          (i) Linkage isomerism            E.g    \left [ Co(NH_3)_5(NO_2) \right ]Cl_2  and   \left [ Co(NH_3)_5(ONO) \right ]Cl_2

          (ii) Ionisation isomerism        E.g    \left [ Co(NH_3)_5SO_4 \right ]Br  and  \left [ Co(NH_3)_5Br\right ]SO_4

          (iii) Coordination isomerism   E.g    \left [ Co(NH_3)_6 \right ]\left [ Cr(CN)_6 \right ]    and   \left [ Cr(NH_3)_6 \right ]\left [ Co(CN)_6 \right ]

          (iv) Solvate isomerism           E.g    \left [ Cr(H_2O)_6 \right ]Cl_3       and       \left [ Cr(H_2O)_5Cl \right ]Cl_2.H_2O

 

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Devendra Khairwa

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