A Colorful Look at the Chelate Effect

• Donald C. Bowman ^[1]
  1. [1] Central Virginia Community College

     Central Virginia Community College

     Estados Unidos

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 83, Nº 8, 2006, pág. 1158
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • 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.