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Coordination Compounds

Question
CBSEENCH12007435
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What is meant by unidentate, didentate and ambidendate ligands ? Give two examples of each. 

Solution

Unidentate: When the ligands can donate the pair of electrons from one atom, it is called unidentate ligands, e.g., NH3, H2O, CN– etc.

Didentate : When the ligand can donate the pair of electrons through two atoms of the ligand, it is called didentate ligand.




Ambidendate: It is that unidentate ligand which can ligate through two different atoms present in it to central atom/ion giving two different coordination entity. Examples are NO2– and SCN– ions. NO2– can ligate through either N or O atom and SCN can ligate through S or N atom to central atom/ion of coordination entity. This results into formation of linkage isomers. 
For example : NO2– group can do coordination to metal ion through or atom forming nitro complex or through oxygen atom forming nitrito complex.
[Co(NH3)5(–NO2)]2+ and [Co(NH3)5(–ONO)]2+.

Some More Questions From Coordination Compounds Chapter

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.

Predict the number of unpaired electrons in the square planar [Pt(CN)4,]2– ion.

The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacynoion contains only one unpaired electron. Explain using crystal field theory.

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