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

• Salete L. Queiroz ^[1] ; Márcio P. de Araujo ^[1] ; Alzir A. Batista ^[1] ; Kenneth S. MacFarlane ^[2] ; Brian R. James ^[2]
  1. [1] Universidade Federal de São Carlos

     Universidade Federal de São Carlos

     Brasil

     
  2. [2] University of British Columbia

     University of British Columbia

     Canadá

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 78, Nº 1, 2001, pág. 87
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • 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.