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Coordination Compounds

Question
CBSEENCH12011187
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Low spin complex of d6 -cation in an octahedral field will have the following energy

(Δo = Crystal field splitting energy in an octahedral field,
P= electron pairing energy)

  • negative 12 over 5 increment subscript straight o space plus straight P
  • negative 12 over 5 increment subscript o space plus 3 P
  • negative 2 over 5 increment subscript straight o space plus 2 straight P
  • negative 2 over 5 increment subscript straight o space plus straight P

Solution

A.

negative 12 over 5 increment subscript straight o space plus straight P

According to crystal field theory, splitting in octahedral field for low spin complex of d6-cation is shown as,

therefore space Total space energy space equals space increment subscript straight o space plus straight P space equals space open parentheses plus 3 over 5 straight x space 0 minus 2 over 5 straight x 6 close parentheses increment subscript straight o space plus straight P equals space minus 12 over 5 increment subscript straight o space plus straight P

Some More Questions From Coordination Compounds Chapter

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.

Calculate the overall complex dissociation equilibrium constant for the Cu(NH3)42+ion, given β4 for this complex is 2.1 x 1013.

Identify the ligands from the following coordination compounds:
(a)    [Co(en)2Cl(NO2)2]
(b)    K[Co(CN)(CO2)(NO)]
(c)    K3[Al(OH)6]
(d)    [Co(H2O)2(NH3)4](OH)3

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