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A Colorful Look at the Chelate Effect

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Donald C. Bowman

Department of Science, Math and Engineering, Central Virginia Community College, Lynchburg, VA 24502

J. Chem. Educ., 2006, 83 (8), p 1158

DOI: 10.1021/ed083p1158

Publication Date (Web): August 1, 2006

Section:

History, Education, and Documentation

Abstract

The relative stabilities of a number of copper(II) and nickel(II) complexes are visually compared by noting color changes that result from ligand exchange reactions. The demonstration illustrates the chelate effect: the increased stability of bidentate ligands over monodentate ligands and in one case, the increased stability of a tetradentate ligand over a bidentate ligand. By carrying out the reactions on an overhead projector, they can be shown to a larger audience of students. The roles that enthalpy and entropy play in the chelate effect are discussed.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Domain):

Demonstrations

Keywords (Feature):

Overhead Projector Demonstrations

Keywords (Subject):

Coordination Compounds

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Supramolecular-Directed Chiral Induction in Biaryl Derivatives
J. Etxebarria, H. Degenbeck, A.-S. Felten, S. Serres, N. Nieto and A. Vidal-Ferran
The Journal of Organic Chemistry2009 74 (22), 8794-8797
- Supramolecular-Directed Chiral Induction in Biaryl Derivatives
  J. Etxebarria, H. Degenbeck, A.-S. Felten, S. Serres, N. Nieto and A. Vidal-Ferran
  The Journal of Organic Chemistry2009 74 (22), 8794-8797
  A thermodynamically controlled resolution has allowed for the generation of diastereomerically enriched complexes, by chirality transfer from an enantiopure building block to a dynamically racemic biaryl derivative. A switchable sense of induction could ...
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