CSIR (Council of Scientific & Industrial Research) Chemical Sciences Inorganic Chemistry-Transition Elements and Coordination Compounds Study Material (Page 4 of 11)

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Bonding Theories

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Valence Bond Theory

Important Points of VBT Are as Follows

  • Metal ion provides vacant d orbitals for the formation of coordinate bonds with ligands.
  • Hybridization involves vacant d orbital along with & orbitals.
  • The number of vacant hybrid orbitals formed is equal to the coordination number of metal ion.
  • Formation of

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Stereochemistry, Dπ-Pπ Bonding, Π Backdonation or Π Back - Bonding

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Dπ - Pπ Bonding

Though the bonding is important for the second period elements, it is of little importance for heavier elements, which give multiple bonds using orbitals. Thus, the bond order of in the (having no vacant orbitals) indicates bonding, due to the overlap of filled

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