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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > July  >
In the Laboratory
A Solid–State NMR Experiment: Analysis of Local Structural Environments in Phosphate Glasses
Stanley E. Anderson and David Saiki
Department of Chemistry, Westmont College, Santa Barbara, CA 93109

Hellmut Eckert and Karin Meise-Gresch
Institut für Physikalische Chemie, Westfälische Wilhelms–Universität, 48149 Münster, Germany

Cover
July 2004
Vol. 81 No. 7
p. 1034
Abstract
The solid state 31P NMR wideline spectra of a series of student-prepared sodium phosphate glasses can easily be measured using a standard multinuclear FTNMR spectrometer available in many chemistry departments. The observed spectra can be simulated by spectral addition of reference solid-state spectra obtained for pure pyrophosphate and metaphosphate salts. Students measure the relative fractions of these phosphorus environments in the glasses and can study the effect on the depolymerization of phosphate as P2O5 when a network modifier as Na2O is added. They learn the principles of solid-state NMR, gain experience of measuring the NMR spectrum of a solid glass, and interpret the spectrum in terms of the composition and localized phosphate environment in this glass.
Supplement
Notes for the instructor, instructions for students, an example of the lab report format, and a section on the fundamentals of NMR and high-resolution NMR are available.
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*  Citation
 Anderson, Stanley E.; Saiki, David; Eckert, Hellmut; Meise-Gresch, Karin. J. Chem. Educ. 2004 81 1034.
*  Keywords
 Analytical Chemistry; Laboratory Instruction; Molecular Properties / Structure; NMR Spectrometry; Solid-State Chemistry
*  History
 Created:
Last Updated:		 May 27, 2004
January 19, 2005
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