1.

Indicate the types of isomerism exhibited by the following complexes and draw the structures for these isomers: (i). K[Cr(H_2O)_2C_2O_3)_2] (ii). [Co(en)_3]Cl_3 (iii). [Co(NH_3)_5(NO_2)](NO_3)_2 (iv). Pt[(NH_3)(H_2O)Cl_2]

Answer»

Solution :(i). `K[Cr(H_2O)_2(C_2O_4)_2]` is of `[M(AA)_2b_2]^(n+-)` type it SHOWS both geometrical isomers (cis and TRANS)
(ii). `[Co(EN)_3Cl_3` is of `[M(AA)_3]^(n+-)` type it shows optical isomers (d- and l-) of cis.
(iii). There are 2 ionisation and 2 linkage isomers. Compounds of `[Ma_5b]^(n+-)` type NEITHER shows geometrical nor optical isomers. Ionisation isomers:
`[Co(NH_3)_5(NO_2)](NO_3)_2`
`[Co(NH_3)_5(NO_3)](NO_3)(NO_2)`
Linkage isomers:
`[Co(NH_3)_5(NO_2)](NO_3)_2,[Co(NH_3)_5(ONO)](NO_3)_2`
(iv). `Pt[(NH_3)(H_2O)Cl_2]` is of `[Ma_2Bc]^(n+-)` type It shows geometrical isomers (cis and trans)


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