Diindolylquinoxalines: Effective indole-based receptors for phosphate anion

A study shows that the new series of indole-based receptors namely 2,3-diindol-3'yl quinoxalines (DIQ, 6 and 7) provide a new series of anion receptors that are particularly effective for the dihydrogen phosphate anion. It is seen that receptor bis(indolyl) allows for the visual detection of this anion via the production of a simple, anion-triggered color change.