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In the Laboratory
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Synthesis of [RuCl2(dppb)(PPh3)] and Identification of the cis- and trans-[RuCl2(dppb)(phen)] Geometrical Isomers via 31P{1H} NMR Spectroscopy. An Undergraduate Experiment for Inorganic Chemistry
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Salete L. Queiroz, Márcio P. de Araujo, and Alzir A. Batista
Departamento de Química, Universidade Federal de São Carlos, CP 676, CEP 13565-905, São Carlos, SP, Brazil
Kenneth S. MacFarlane and Brian R. James
Department of Chemistry, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada
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January 2001
Vol. 78 No. 1
p. 87
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| Abstract |
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A 31P{1H} NMR experiment for undergraduate students is presented involving the conversion of trans-[RuCl2(dppb)(phen)] to cis-[RuCl2(dppb)(phen)] (dppb = 1,4-bis(diphenylphosphino)butane; phen = 1,10-phenanthroline). This experiment (i) demonstrates the use of 31P{1H} NMR to distinguish between cis and trans geometric isomers of coordination compounds in solution, (ii) describes the concept of spin-spin coupling for P atoms by assigning signals to equivalent and nonequivalent P atoms, and (iii) offers an introduction to synthesis and in situ NMR work requiring semirigorous, inert-atmosphere conditions. The experiment can be accommodated in about four hours of laboratory time.
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| More Information |
 Citation |
Queiroz, Salete L.; de Araujo, Márcio P.; Batista, Alzir A.; MacFarlane, Kenneth S.; James, Brian R. J. Chem. Educ. 2001 78 87.
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Keywords |
Coordination Chemistry; Inorganic Chemistry; Inorganic Synthesis; Laboratory Instruction; Mechanisms; Phosphorus; Ruthenium; Transition Elements
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History |
Created:
Last Updated: |
November 30, 2000
August 31, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
2001
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January
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87
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