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Measurement of the Isotopic Ratio of 10B/11B in NaBH4 by 1H NMR

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Murray Zanger and Guillermo Moyna

Department of Chemistry and Biochemistry, University of the Sciences in Philadelphia, Philadelphia, PA 19104-4495

J. Chem. Educ., 2005, 82 (9), p 1390

DOI: 10.1021/ed082p1390

Publication Date (Web): September 1, 2005

Section:

History, Education, and Documentation

Abstract

A simple and remarkably accurate method for estimating the isotopic ratio between ¹⁰B and ¹¹B through the use of ¹H nuclear magnetic resonance (NMR) spectroscopy is presented. The experiment relies on the splitting caused by ¹⁰B (I = 3) and ¹¹B (I = 3/2) on the ¹H signal of a proton directly bound to boron, a phenomenon readily observed on an aqueous sample of NaBH₄. In combination with a brief lecture or prelaboratory presentation, this laboratory can serve to introduce students to magnetic properties as well as theoretical and experimental aspects of NMR spectroscopy as early as the freshman-level chemistry.

Keywords (Audience):

First-Year Undergraduate / General

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Instrumental Methods

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Received: August 03, 2009

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Measurement of the Isotopic Ratio of 10B/11B in NaBH4 by 1H NMR