9.21 Draw all the isomers (geometrical and optical) of:
(i) [CoCl2(en)2] +
(ii) [Co(NH3)Cl(en)2] 2+
(iii) [Co(NH3)2Cl2(en)]+
9.21 Draw all the isomers (geometrical and optical) of:
(i) [CoCl2(en)2] +
(ii) [Co(NH3)Cl(en)2] 2+
(iii) [Co(NH3)2Cl2(en)]+
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1 Answer
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Two types of ligand : chloride ion is unidentate ligand and -en (ethylenediamine) is bidentate ligand with two sites of attachment. The complexes in which two symmetrical bidentate chelating ligands AA and two monodentate ligands a, are coordinated to central metal atom M, exhibit the phenomenon of optical isomerism and can be resolved into their optical isomers.
An example of this type of complexes is given as shows both geometrical as well as optical isomerism. Its cis form is unsymmetrical, while the trans form is symmetrical because it contains a plane of symmetry. Hence, optical isomerism is shown by cis form.
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