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The Complexation of the Na+ by 18-Crown-6 Studied via Nuclear Magnetic Resonance

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Steven J. Peters and Cheryl D. Stevenson

Department of Chemistry, Illinois State University, Normal, IL 61790-4160

J. Chem. Educ., 2004, 81 (5), p 715

DOI: 10.1021/ed081p715

Publication Date (Web): May 1, 2004

Section:

History, Education, and Documentation

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.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

NMR Spectroscopy

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The Complexation of the Na+ by 18-Crown-6 Studied via Nuclear Magnetic Resonance