+91-8076753736[email protected]
logo
logo
-->

Coordination Compounds

Question
CBSEENCH12007479
Wired Faculty App

Discuss the nature of bonding in metal carbonyls.

Solution

Carbonyls are formed by the transitional elements because of the presence of vacant d-orbitals. In carbonyl the oxidation state of the metal is zero. 
During the formation of carbonyls the vacant d-orbitals of metal are over-lapped by the filled carbon σ-orbitals. This results the formation of σ-bond between metal and C of CO due to the donation of electron pair of carbon into the vacant d-orbitals of metal. On the other hand a π-overlap takes place by a back donation of electrons from a filled d-orbitals of metal into the vacant antibonding πp-orbitals of CO and a pπ  M → C bond is formed.



Donation of lone pair of electrons by the C of CO into vacant d-orbital of the metal (sigma overlap)
.


Fig. Donation of electrons from filled d-orbitals of metal into vacant antibonding π p - orbital of CO(Pit overlap).

Some More Questions From Coordination Compounds Chapter

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

Write IUPAC name of the following complexes:
(a)    [Fe(H2O)6]SO4
(b)    [Cu(en)2(NO3)2

Give IUPAC name of the following complexes:
(i) Na2[Fe(CN)5(NO)],       (ii) K2[Zn(CN)4]

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation