9.33 Give the oxidation state, d orbital occupation and coordination number of the central metal ion in the following complexes:
(i) K3[Co(C2O4)3]
(ii) cis-[CrCl2(en)2]Cl
(iii) (NH4)2[CoF4]
(iv) [Mn(H2O)6]SO4
9.33 Give the oxidation state, d orbital occupation and coordination number of the central metal ion in the following complexes:
(i) K3[Co(C2O4)3]
(ii) cis-[CrCl2(en)2]Cl
(iii) (NH4)2[CoF4]
(iv) [Mn(H2O)6]SO4
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1 Answer
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(i) Overall charge balance:
X + 3 (-2) = -3 X = + 3
Oxidation state of Co is + 3.
As there are 3 oxolate ion and being bidentate, coordination no. Of complex is 6. So it is octahedral complex.
d orbital occupation: t2g6eg0 (oxolate ion is weak field ligand, does not cause pairing of electron as the energy required for pairing of electron is more than CFSE).
(ii) Overall charge balance:
X + balance4 (-1) = -2 X = + 2
Oxidation state of Co is + 2.
As there are 4 fluoride ion, coordination no. Of complex is 4 i.e. Tetrahedral complex.
d orbital occupation: eg4t2g3 (fluoride ion is weak field ligand, does not cause pairing of electron as th
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