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Synthesis of Fluorescent Dipyrrolequinoxaline Conjugated Polymer Sensors for Fluoride, Cyanide and Similar Anions

 

A series of new conjugated polymers with varying percentage loading of dipyrrolequinoxaline receptor were synthesized. The polymer backbones were incorporated with pendant (PDPQ-PPETE) and non-pendant (NDPQ) dipyrrolequinoxaline receptors. The polymers were fully characterized by spectroscopic methods and evaluated as fluorescent chemosensors in solution for selective detection of fluoride and cyanide anions. The acidic pyrrole N-H protons serve as the receptor unit in each polymer. The fluorescent quantum yield and lifetime measurements of the dipyrrolequinoxaline polymers were measured at room temperature in tetrahydrofuran. The NDPQ polymer displayed high sensitivity and selectivity in the detection of fluoride anion at 10-8 M concentration.

 
 
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updated, April 2006.