Prev. Article Next Article Table of Contents

Article

Simple Preparation and NMR Analysis of mer and fac Isomers of Tris(1,1,1-trifluoro-2,4-pentanedionato)cobalt(III). An Experiment for the Inorganic Chemistry Laboratory

Your current credentials do not allow retrieval of the full text.

Purchase the full-text

PDF/HTML,
figures/images,
references and tables,
(where available)

Ashley W. Jensen and Brian A. O'Brien

Department of Chemistry, Gustavus Adolphus College, Saint Peter, MN 56082

J. Chem. Educ., 2001, 78 (7), p 954

DOI: 10.1021/ed078p954

Publication Date (Web): July 1, 2001

Section:

History, Education, and Documentation

Abstract

A one-step procedure for the preparation of tris(1,1,1-trifluoro-2,4-pentanedionato)cobalt(III) from hydrated cobalt(II) carbonate and 10% hydrogen peroxide, in which tert-butyl alcohol is used as a component of the solvent, is described. The procedure is short, simple, and less hazardous than procedures reported in the literature, and the starting materials are readily available and inexpensive. The product is a mixture of mer and fac isomers that can be separated by silica gel chromatography with toluene as the eluent. Thin-layer chromatography is used to obtain a collective class sample of each isomer for ¹H, ¹³C, and ¹⁹F NMR analysis. The NMR analyses clearly illustrate the threefold rotational symmetry of the fac isomer and the lack of symmetry of the mer isomer. Detailed NMR data are provided for each isomer.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Inorganic Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Chromatography

View: Hi-Res PDF | PDF w/ Links

Citing Articles

Citation data is made available by participants in CrossRef's Cited-by Linking service. For a more comprehensive list of citations to this article, users are encouraged to perform a search in SciFinder.

This article has been cited by 1 ACS Journal articles (1 most recent appear below).

The Trans Effect: A Guided-Inquiry Experiment for Upper-Division Inorganic Chemistry
Janet L. Shaw , Christopher R. Dockery , Scott E. Lewis , Lindsay Harris and Richard Bettis
Journal of Chemical Education2009 86 (12), 1416
- The Trans Effect: A Guided-Inquiry Experiment for Upper-Division Inorganic Chemistry
  Janet L. Shaw , Christopher R. Dockery , Scott E. Lewis , Lindsay Harris and Richard Bettis
  Journal of Chemical Education2009 86 (12), 1416
  This article describes a guided-inquiry laboratory for upper-division inorganic chemistry. The experiment is designed to teach students about the trans effect through synthesis of the cis and trans geometric isomers of diamminedichloroplatinum(II). ...
  Abstract | Hi-Res PDF | PDF w/ Links