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Coordination Compounds

Question
CBSEENCH12011343
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In which of the following coordination entities the magnitude of Δo (CFSE in the octahedral field) will be maximum?

(Atomic number Co = 27)

  • [Co(H2O)6]3+

  • [CO(NH3)6]3+

  • [CO(CN)6]3-

  • [Co(C2O4)3]3-

Solution

C.

[CO(CN)6]3-

The magnitude of Δoct (the orbital splitting energy) is decided by the nature of ligand. Strong field ligand has highest Δoct .The increasing field strength is as
straight I to the power of minus space less than thin space Br to the power of minus space less than thin space Cl to the power of minus less than space straight F to the power of minus less than OH to the power of minus space straight H subscript 2 straight O space less than thin space straight C subscript 2 straight O subscript 4 to the power of 2 minus end exponent space less than space NH subscript 3 space less than thin space en space less than thin space NO subscript 2 to the power of minus space less than thin space CN to the power of minus
The CN- is the strongest ligand among these hence the magnitude of Δoct will be maximum in [Co(CN)6]3-

Some More Questions From Coordination Compounds Chapter

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.

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