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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > May  >
In the Laboratory
The Complexation of the Na+ by 18–Crown–6 Studied via Nuclear Magnetic Resonance
Steven J. Peters and Cheryl D. Stevenson
Department of Chemistry, Illinois State University, Normal, IL 61790-4160
Cover
May 2004
Vol. 81 No. 5
p. 715
Abstract
A novel NMR experiment used in the undergraduate physical chemistry laboratory is described. This 23Na NMR experiment allows students to accurately measure the thermodynamic equilibrium constant for the complexation of sodium ions by 18–crown–6. The use of 23Na NMR is relatively simple for the students to set up and it gives them an opportunity to use multinuclear NMR techniques and to apply them to a Nobel Prize winning concept. Concepts such as noncovalent interactions, Heisenberg line broadening, quadrupole nuclei, linear regression analysis, chemical shielding, and solution equilibrium thermodynamics are also demonstrated.
Supplement
Instructions for the students and notes for the instructor are available.
*  Contents JCE2004p0715W.doc (Microsoft Word)
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More Information
*  Citation
 Peters, Steven J.; Stevenson, Cheryl D. J. Chem. Educ. 2004 81 715.
*  Keywords
 Equilibrium; Laboratory Instruction; NMR Spectrometry; Physical Chemistry
*  History
 Created:
Last Updated:		 April 1, 2004
February 18, 2005
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