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With the decrease of pH value from 8.45 to –1.0, the UV-Vis absorption and fluorescent spectra of 1,2-bis(4-pyridyl) ethylene(BPE) took on the same changing trend at four different successive pH stages: 8.45―7.20, 7.20―5.62, 5.62―2.60, and 2.60―-1.0, name