Chelating ligands often form more stable complex ions than the corresponding monodentate
Chapter 21, Problem 21.105(choose chapter or problem)
Chelating ligands often form more stable complex ions than the corresponding monodentate ligands with the same donor atoms. For example, Ni21 1aq2 1 6NH3 1aq2mNi1NH32 6 21 1aq2 K 5 3.2 3 108 Ni21 1aq2 1 3en1aq2mNi1en2 3 21 1aq2 K 5 1.6 3 1018 Ni21 1aq2 1 penten1aq2mNi1penten2 21 1aq2 K 5 2.0 3 1019 where en is ethylenediamine and penten is N CH2 2 NCH NH2CH2CH2 CH2CH2NH2 NH2CH2CH2 CH2CH2NH2 This increased stability is called the chelate effect. Based on bond energies, would you expect the enthalpy changes for the above reactions to be very different? What is the order (from least favorable to most favorable) of the entropy changes for the above reactions? How do the values of the formation constants correlate with DS8? How can this be used to explain the chelate effect?
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