Optical sensing of inorganic anions employing a synthetic receptor and ionic colorimetric dyes

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Abstract
A novel optical sensing methodology for nitrate ions has been developed using an ensemble of a synthetic receptor and colorimetric dyes as indicators. Neutral receptor 1 forms one to one complexes with anionic dyes such as Resorufin or Methyl Red in organic solvents. The equilibrium between receptor and dye is perturbed by added nitrate ion, resulting in a receptor–nitrate complex. The displacement of the indicator by nitrate causes large absorbance changes, because of alternation of the microenvironment of the chromophore. The association constants between receptor 1 and various anions were determined by analyzing the intensity changes.

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