Detection
and Differentiation of Neutral Organic Compounds
by <sup>19</sup>F NMR with a Tungsten Calix[4]arene Imido Complex
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Abstract
Fluorinated
tungsten calix[4]arene imido complexes were synthesized
and used as receptors to detect and differentiate neutral organic
compounds. It was found that the binding of specific neutral organic
molecules to the tungsten centers induces an upfield shift of the
fluorine atom appended on the arylimido group, the extent of which
is highly dependent on electronic and steric properties. We demonstrate
that the specific bonding and size-selectivity of calix[4]arene tungsten–imido
complex combined with <sup>19</sup>F NMR spectroscopy is a powerful
new method for the analysis of complex mixtures