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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > March  >
In the Classroom
Advanced Chemistry Classroom and Laboratory
Undergraduate Lectures on Infrared Spectroscopy in the Solid State
E. A. Secco
St. Francis Zavier University, Chemistry Department, P.O. Box 5000, Antigonish, Nova Scotia B2G 2W5, CANADA
Cover
March 1999
Vol. 76 No. 3
p. 373
Abstract
Our lectures on spectroscopy in an undergraduate physical chemistry course are accompanied by a laboratory experiment in recording and interpreting the infrared spectra of complex compounds such as Cu4(OH)6(NO3)2 and Cu4(OH)6SO4 in the solid state. This experimental exercise exposes students to the reduction in symmetry for a polyatomic species such as NO3- or SO42- in a crystalline lattice. This symmetry reduction provides an insight into the intramolecular effects as reflected on the internal and external modes of the species. Since these interacting forces can yield a vibrational multiplet structure arising from three main effects-(i) factor group or correlation field splitting, (ii) site group splitting, and (iii) multiple site splittings-students are introduced to a cursory treatment of factor group analysis. The experiment illustrates how splitting of degenerate modes occurs and how infrared inactive modes become active.
More Information
*  Citation
 Secco, E. A. J. Chem. Educ. 1999 76 373.
*  Keywords
 IR Spectroscopy; Solid-State Chemistry; Crystallography / Crystal Growth
*  History
 Created:
Last Updated:		 June 15, 1999
June 22, 2005
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