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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 12 Issue 3 (2007) pp 171-174

Reflectance FTIR Spectroscopy Sampling Techniques for an Undergraduate Instrumental Analysis Laboratory

Katherine C. Lanigan*, Karrie M. Manes, and Katie L. Pidsosny

Department of Chemistry and Biochemistry, University of Detroit Mercy, Detroit, MI 48221,
Received August 10, 2006. Accepted February 10, 2007.

Published online: 4 June 2007

Abstract. This FTIR spectroscopy experiment is designed to provide undergraduate chemistry students with experience in using sampling methods commonly used in industry and research. In the experiment described here the use of modern infrared sampling techniques, DRIFTS (Diffuse Reflectance Infrared Fourier Transform Spectroscopy) and ATR-FTIR (Attenuated Total Reflectance–Fourier Transform Infrared) spectroscopy are used in addition to the traditional transmission mode of infrared spectroscopy. Using these methods, powder and aqueous- phase samples can be analyzed for structural characteristics of water soluble organic ligands. In the experiment, ethylenediaminetetraacetic acid (EDTA) sodium salts are studied as well as the complexation between EDTA and lead ions. Students assign vibrational bands in the spectra, analyze band shifts for evidence of complexation, and learn the differences between transmission and reflectance mode sampling techniques.

Key Words: Laboratories and Demonstrations; organic chemistry;synthesis ; FTIR

(*) Corresponding author. (E-mail:

Article in PDF format (214 KB) HTML format

Supporting Materials:

A Student Handout and Instructor’s Notes are available as supporting materials. (116 KB).

Issue date: June 1, 2007

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