Resumen de Preparation of nido-Carborane Derivatives:: Variation of the 31P{1H} NMR Pattern by Changing the Coordinating Ligand. A Microscale Laboratory
O. Crespo, M. C. Gimeno, Antonio Laguna Castrillo
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.
