Chemical Entity Data Page

Chelate (AS/A2 generic)
  Belongs to a sub-set of generics specific to the British A-Level exam system.

Complexes with bidentate of multidentate ligands which form five or six membered rings with the metal ligand are generally more stability than the equivalent complexes with monodentate ligands. This is known as the chelate (crab) effect. The argument is that chelate complexations are entropy driven processes: the complexation equilibrium is driven by the release of six small ligands, rather than by the enthalpy (heat release) of complexation.
Wikipedia Page:

Chelate (AS/A2 generic)
is defined with respect to the entities below:
The entities below are defined with respect to:
Chelate (AS/A2 generic)
Complex (AS/A2 generic)

Type 23 Lewis acid/base complex (generic)

Cobalt(II) EDTA complex ion

Cobalt(II) tris(ethanedioate) complex ion

Cobalt(II) tris(ethylenediamine) ion

Cobalt(III) dichloro bis(ethylenediamine) complex ion

Copper(II) EDTA complex ion


Iron(II) bipyridyl ion

Iron(III) tris(ethanedioate) complex ion

Nickel(II) tris(ethylenediamine) ion

© Mark R. Leach 1999 –

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