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Engineering LibreTexts

9: Complexation

  • Page ID
    • 9.1: Metals Complexation in Aqueous Solution
      Coordination complexes have been known and studied since the mid-nineteenth century. and their structures had been mostly worked out by 1900. Although the hybrid orbital model was able to explain how neutral molecules such as water or ammonia could bond to a transition metal ion, it failed to explain many of the special properties of these complexes. Ligand field theory was developed that is able to organize and explain most of the observed properties of these compounds.
    • 9.2: Acidity of the Hexaaqua Ions
      This page explains why hexaaqua complex ions are acidic.
    • 9.4: Chelation
      A metal ion in solution does not exist in isolation, but in combination with ligands (such as solvent molecules or simple ions) or chelating groups, giving rise to complex ions or coordination compounds. These complexes contain a central atom or ion, often a transition metal, and a cluster of ions or neutral molecules surrounding it.
    • 9.3 Metals Complexes With Ligands Other Than Hydroxide
      This page explains what is meant by a stability constant for a complex ion, and goes on to look at how its size is governed in part by the entropy change during a ligand exchange reaction.
    • 9.5: Origin of Color in Complex Ions
      This page is going to take a simple look at the origin of color in complex ions - in particular, why so many transition metal ions are colored.