Class 12 Chemistry D and F Block Elements Formation of Complex Compounds

Formation of Complex Compounds

  • The cations of transition metals have great tendency to form complexes with several molecules or ions called ligands.
  • The bonds involved in the formation of complexes are coordinate and hence the complexes are called coordinate complexes.
  • The structure of these complex ions is linear, square, planar, tetrahedral, octahedral depending upon nature of hybridization of metal ions.
  • The weak ligand like CO, NO forms complexes only when transition metals are in zero due to the availability of vacant orbitals in the donor atom of the ligand in addition to lone pair.
  • The highly electronegative and basic ligand like F-, Cl- can form complexes with transition metals even though there are in high oxidation states due to the presence of small, highly charged or neutral ligands with lone pair of electrons that can form strong sigma bond by donating a lone pair of electrons.
  • In a transition series the stability of complexes increases with the rise in atomic number.
  • The transition metal atom reveals multiple oxidation state; the higher valent ion forms more stable complexes.
  • A few examples are: [Fe (CN)6]3–

  • [Fe(CN)6]4–

  • [Cu(NH3)4]2+

  • [PtCl4]2–





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