Preparation of nido-Carborane Derivatives:: Variation of the 31P{1H} NMR Pattern by Changing the Coordinating Ligand. A Microscale Laboratory

• O. Crespo ^[1] ; M. Concepción Gimeno ^[1] ; Antonio Laguna ^[1]
  1. [1] Universidad de Zaragoza

     Universidad de Zaragoza

     Zaragoza, España

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 77, Nº 1 (January), 2000, págs. 86-86
• Idioma: inglés
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• Resumen

  • Nuclear magnetic resonance spectroscopy is a common technique for studying the nature of compounds. Here we present an easy synthesis that illustrates how a slight change of the ligands in a complex can determinate the pattern in the NMR spectrum. We have chosen two o-carborane derivatives because of the growing interest in the applications of such complexes. The stoichiometry of both complexes is the same, [Ag{7,8-(PPh2)2-7,8-C2B9H10}(PR3)], where PR3 is PPh2Me or PPh3. When changing from PPh2Me to PPh3 the pattern of the 31P{1H} NMR spectrum is modified from an AX2 system to an AB2 system, with coupling to the silver nuclei 109Ag and 107Ag for both complexes.