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Thursday, 23 February 2017

Co-ordination Compounds - IV


Magnetic properties of coordination compounds:

A coordination compound is paramagnetic in nature if it has unpaired electrons and diamagnetic if all the electrons in the coordination compound are paired.
Magnetic moment where n is number of unpaired electrons.
Crystal Field Theory:
It assumes the ligands to be point charges and there is electrostatic force of attraction between ligands and metal atom or ion.
It is theoretical assumption.

Crystal field splitting in octahedral coordination complexes:

Crystal field splitting in tetrahedral coordination complexes:

For the same metal, the same ligands and metal-ligand distances, the difference in energy between eg and t2g level is

Metal carbonyls:
  • Metal carbonyls are homoleptic complexes in which carbon monoxide (CO) acts as the ligand.
  • Example: Ni(CO)4
  • The metal-carbon bond in metal carbonyls possess both s and p character.
  • The M–C σ bond is formed by the donation of lone pair of electrons from the carbonyl carbon into a vacant orbital of the metal.
  • The M–C p bond is formed by the donation of a pair of electrons from a filled d orbital of metal into the vacant antibonding p * orbital of carbon monoxide.
  • The metal to ligand bonding creates a synergic effect which strengthens the bond between CO and the metal.
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