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Coordination Compounds
Question
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Illustrate the isomerism:
Coordination isomerism in coordination compounds.

Answer

Coordination isomerism: This type of isomerism occurs in compounds containing both cationic and anionic complexes and isomers differ in the distribution of ligands in the coordination sphere of cationic and anionic parts. The examples are:

(i) [Co(NH3)6] [Cr(CN)6] and [Cr(CNH3)6] [Co(CN)6]
(ii)[Cu(NH3)4] [PtCl4] and [Pt(NH3)4] [CuCl4]

This type of isomerism is also shown by compounds in which the metal ion is the same in both cationic and anionic complexes. For example:

(a) [Cr(NH3)6] [Cr(CN)6] and [Cr(NH3)2(CN)4][Cr(NH3)2(CN)4]
(b) [Pt(NH3)4] [PtCl4] and [PtCl(NH3)3] [PtCl3(NH3)]

 

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Some More Questions From Coordination Compounds Chapter

Write the formula for the following coordination compound:
Potassium tetracyanidonickelate(II)

Write the formula for the following coordination compound:
Tris(ethane -1, 2-diamine) chromium(III) chloride

Write the formula for the following coordination compound:
Amminebromidochloridonitrito-N-platinate (II)

Write the formula for the following coordination compound:
Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:
Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:
(i) [Co(NH3)6]Cl3
(ii) [Co(NH3)5Cl]Cl2
(iii) K3[Fe(CN)6]
(iv) K3[Fe(C2O4)3]
(v) K2[PdCl4]
(vi) [Pt(NH3)2Cl(NH2CH3)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:
(i)    K[Cr(H2O)2(C2O4)2],                      (ii) [Co(en)3Cl3,
(iii) [Co(NH3)5(NO2)]|NO3]2,                 (iv) [Pt(NH3)(H2O)Cl2]

Explain on the basis of valence bond theory that [Ni(CN)4]2–  ion with square planar is diamagnetic and the [NiCl4]2– ion with tetrahedral geometry is paramagnetic.