A Solid-State NMR Experiment: Analysis of Local Structural Environments in Phosphate Glasses

Hellmut Eckert and Karin Meise-Gresch
Institut für Physikalische Chemie, Westfälische Wilhelms–Universität, 48149 Münster, Germany
Stanley E. Anderson and David Saiki
Department of Chemistry, Westmont College, Santa Barbara, CA 93109
J. Chem. Educ., 2004, 81 (7), p 1034
DOI: 10.1021/ed081p1034
Publication Date (Web): July 1, 2004

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.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Solid State Chemistry
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History

  • Received: August 03, 2009

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