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Abstract
(Triphenylphosphoranylidene)cyclopenta-1,3-dienes with stabilized zwitterionic resonance structures showed the application feasibility as new pH indicators. In terms of absorption intensity occurring from the acid–base reactions, (triphenylphosphoranylidene)cyclopenta-1,3-dienes displayed strong colors with high extinction coefficients in the alkali pH range. Resonance structures of (triphenylphosphoranylidene)cyclopenta-1,3-dienes in alkali media stabilize anionic ions. Three derivatives of (triphenylphosphoranylidene)cyclopenta-1,3-dienes 1a– c, are used as pH indicators in the range 10–12. For these compounds color change in the pH range 10–12 was extremely sharp, clear and reversible. But there are not many indicators in the pH range 10–14.
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