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Experiments with Tris(ethylenediamine)cobalt(III) Compounds: 59Co NMR and the Resolution of Enantiomeric [Co(en)3]3+ Ion and Analysis by Formation of Diastereomeric Ion Pairs

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L. L. Borer , J. G. Russell , and R. E. Settlage

Department of Chemistry, California State University, Sacramento, Sacramento, CA 95819-6057

R. G. Bryant

Department of Chemistry, University of Virginia, Charlottesville, VA 22901

J. Chem. Educ., 2002, 79 (4), p 494

DOI: 10.1021/ed079p494

Publication Date (Web): April 1, 2002

Section:

History, Education, and Documentation

Abstract

Cobalt(III) complexes have been used in the undergraduate inorganic laboratory to demonstrate various techniques in coordination chemistry. This report describes an experiment involving the synthesis and resolution of enantiomeric tris(ethylenediamine)cobalt(III) compounds followed by the analysis of enantiomeric purity by optical rotation and ⁵⁹Co NMR spectroscopy through the formation of diastereomeric ion pairs.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Inorganic Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Chirality / Optical Activity

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Received: August 03, 2009

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Experiments with Tris(ethylenediamine)cobalt(III) Compounds: 59Co NMR and the Resolution of Enantiomeric [Co(en)3]3+ Ion and Analysis by Formation of Diastereomeric Ion Pairs