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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > January  >
In the Laboratory
The Microscale Laboratory
Preparation of nido-Carborane Derivatives: Variation of the 31P{1H} NMR Pattern by Changing the Coordinating Ligand. A Microscale Laboratory
O. Crespo, M. Concepción Gimeno, and Antonio Laguna
Departamento de Química Inorgànica, Universidad de Zaragoza, E-50009 Zaragoza, Spain
Cover
January 2000
Vol. 77 No. 1
p. 86
Abstract
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.
More Information
*  Citation
 Crespo, Olga; Gimeno, M. Concepción; Laguna, Antonio. J. Chem. Educ. 2000 77 86.
*  Keywords
 Nobelium; Microscale; Laboratory Instruction; NMR Spectrometry; Inorganic Synthesis
*  History
 Created:
Last Updated:		 December 9, 1999
April 15, 2005
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