Synthesis and fluorescence of crown ethers containing coumarin

摘要

The syntheses and fluorescence properties of a series of novel crown ethers containing coumarin group are presented.2-(Benzocourmarin-3-acyloxymethyl)crown ethers were synthesized by reacting the acyl chloride of benzocourmarin-3-carboxylic acid with 2-hydroxymethyl crown ethers,while 4'-(benzo-courmarin-3-carboxamido)benzo crown ethers were secured by reacting the acyl chloride of benzo-courmarin-3-carboxylic acid with 4'-aminobenzo crown ethers.Only the ester-type crown ethers were fluorescent.As the polarity of the solvent increased,the emission maximum lambda_(em)showed a slight red shift.DMSO was used as the fluorescence quenching solvent.Increased fluorescence was observed upon the addition of alkali and alkaline earth metal ions.