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  Home > JCE Print > Journal of Chemical Education > Issues > 2008  > March  >
In the Laboratory
Synthesis and Symmetry of Two Cobalt(III) Complexes with Tetradentate Ligands
An Advanced Inorganic Chemistry Experiment
Mark McClure
Department of Chemistry and Physics, The University of North Carolina at Pembroke, Pembroke, NC 28372-1510
Cover
March 2008
Vol. 85 No. 3
p. 420

Abstract
In this laboratory exercise, students synthesize two series of cobalt(III) complexes prepared from the tetradentate ligands triethylenetetramine and tris(2-aminoethyl)amine. Although these two ligands have the same chemical formula, the former is linear and the latter is branched, giving rise to complexes with different symmetries. Whereas triethylenetetramine coordinates to form a complex that has a C2 symmetry axis, tris(2-aminoethyl)amine forms a complex that has a mirror plane. The symmetries of the corresponding complexes are examined through the use of 13C NMR spectroscopy.
Supplement
Student handouts icluding post-lab questions; Instructor notes including the answers to the post-lab questions and the 13C NMR spectra
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Contents
More Information
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Citation
McClure, Mark. J. Chem. Educ. 2008, 85, 420.
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Keywords
Cobalt; Coordination Compounds; Hands-On Learning / Manipulatives; Inorganic Chemistry; Laboratory Instruction; NMR Spectroscopy; Synthesis; Upper-Division Undergraduate
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History
Created:
Last Updated:
2/4/2008
2/8/2008
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Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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