Chemqueries: Hybridization in coordination compound

Hybridization in coordination compound

Hybridization in coordination compound:

       The main application of Valence Bond Theory is to predict hybridization in coordination compound.
  • Hybridization is the concept of mixing of atomic orbital into a new hybrid orbital.
  • For example , if one s-orbital combine with one p-orbital it will form a new sp hybrid orbital.
          Like that, sp2hybrid orbital = one s-orbital + two p-orbital
                           sp3 hybrid orbital = one s-orbital + three p-orbital
                           sp2d hybrid orbital = one s-orbital + two p-orbital + three p-orbital
                           sp3d2 hybrid orbital =  one s-orbital + three p-orbital + two d-orbital
  • The coordination number of metal atom or ion decide the hybridization and  geometry of the complex.
          For example if the coordination number is 6 , then 6 hybrid orbital combine among themselves            and give  sp3dhybridization.
  • If the coordination number is 6 two possibilities is there i.e.
                    1. Inner orbital Octahedral complex( d2sp3hybridization.)
                    2. Outer orbital Octahedral complex( sp3d2hybridization.)
               But , both the hybridization leads to Octahedral geometry.
  • If the coordination number is 4 there is the possibilities of two types of geometry i.e.
                    1. Tetrahedral complex ( sphybridization)
                    2. Square planar complex( dsp2hybridization)

  • Outer orbital complex: 
          Here d-orbital of outermost shell or nth shell participate in bonding.So the hybridization will be sp3d(d-orbital present in outer side)
  • Inner orbital complex:
          Here d-orbital of inner shell or penultimate shell or (n-1)th shell participate in bonding.So the hybridization will be d2sp3 (d-orbital present in inner side)

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