A novel fluorescent ratiometric chemosensor based on 4-pyren-1-yl-pyrimidine (PPM) has been designed and prepared for the detection of Hg2+ in the presence of other competing metal ions in acetonitrile. The photo exhibits fluorescence color change of PPM from blue to green without and with Hg2+, which red shift of wavelength about 105 nm in fluorescence emission spectra. It can serve as a highly selective chemodosimeter for Hg2+ with ratiometric and naked-eye detection. The photophysical properties of PPM confirmed a 2:1 (PPM-Hg2+) binding model and the spectral response toward Hg2+ was proved to be reversible. (C) 2012 Elsevier Ltd. All rights reserved.
Prediction of photophysical properties of pyrimidine chromophores using Taguchi method
(DFT) calculations. It was intriguing to find that these 4-monosubstituted pyrimidine compounds exhibited bright fluorescence with excellent quantumyields (∼0.53–0.93) in the blue region. PM1 and PM2 had a lower LUMO than that of CBP (4,4′-di(9H-carbazol-9-yl)biphenyl), meaning that both of them had better electron injection and transfer abilities. The variation tendencies of energy levels and absorption