SCHEDULED MAINTENANCE
The intense yellow colour of the 4-nitrophenolate anion 2, in MeCN or CH2Cl2 solution, dissipates upon complex formation with meso-octamethylcalix[4]pyrrole 1; the complex may be used as a colourimetric sensor for halide anions, such as fluoride, that displace the phenolate anion thereby restoring the yellow colour, characteristic of free 4-nitrophenolate anion, to solutions containing 1, 2 and the anion in question.
P. A. Gale, P. A. Gale, L. J. Twyman, C. I. Handlin and J. L. Sessler, Chem. Commun., 1999, 1851 DOI: 10.1039/A905743I
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