Fluorescence emission studies of 4-(2-furylmethylene)-2-phenyl-5-oxazolone embedded in polymer thin film and detection of Fe~(3+)ion

摘要

The photophysical and photochemical properties of azlactone derivative 4-(2-furylmethylene)-2-phenyl-5-oxazolone (PFO)were examined in solvents of tetrahydrofuran (THF),acetonitrile (ACN)and dichloromethane (DCM)and in solid matrix of polyvinyl chloride (PVC).The PFO dye embedded in plasticized PVC matrix has been used in monitoring Fe~(3+).The PFO dye exhibited satisfactory fluorescence emission based optical response to Fe~(3+)with a detection limit of 3.8 X 10~(-6)M.The sensor composition exhibited a dynamic response to Fe~(3+)in the concentration range of 6 X 10~(-4)-6 X 10~(-4)M.The sensor is fully reversible within the dynamic range and the response time (tau is approximately 2 min under batch conditions.The reproducibility of the sensor membrane was investigated by alternately changing the solution of 2 X 10~(-5)M Fe~(3+)and BES buffer (10~(-3)M,pH =7.0),and relative standard deviation was cal-culatedas 0.4% (n =7).pH dependence is negligible in the pH range of 4.0-11.0.ThecrosssensitivityofPFO to Co~(2+),Ni~(2+),Zn~(2+)and Cu~(2+)was also tested and evaluated.