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Article

The Octahedral-Square-Planar Transition of Nickel Chelates

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Lina Ben-Dor and Yizhak Marcus

The Hebrew University of Jerusalem, Department of Inorganic and Analytical Chemistry, Jerusalem 91904, ISRAEL

J. Chem. Educ., 1998, 75 (11), p 1458

DOI: 10.1021/ed075p1458

Publication Date (Web): November 1, 1998

Section:

History, Education, and Documentation

Abstract

An experiment for an advanced inorganic chemistry laboratory is proposed that involves the study of the equilibrium between the (blue) octahedral and (yellow) square planar chelates of nickel(II) with tetraaza ligands in solution. The ligands employed are the linear triethylenetetramine and the cyclic cyclam. Changes in the ionic strength or the temperature of the solutions shift the equilibrium, which is followed spectrophotometrically.