A colourimetric calix [4] pyrrole–4-nitrophenolate based anion sensor†

…, LJ Twyman, CI Handlin, JL Sessler

Index: Gale, Philip A.; Twyman, Lance J.; Handlin, Cristin I.; Sessler, Jonathan L. Chemical Communications, 1999 , # 18 p. 1851 - 1852

Full Text: HTML

Citation Number: 55

Abstract

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.