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@The titration of the diprotonated form of 3,7,13,17-tetramethyl-2,8,12,18-tetrabutylporphyrin with the series of halide ions has been done in the acetonitrile solution. It was shown that the stable complexes of 1:1 and 1:2 structures with halide ions have been formed. The influence of complexation with halide ions on the porphyrin fluorescent properties has been studied. The strong quenching of the porphyrin fluorescence has been found. It was established that both static quenching upon the nonfluorescent complex formation due to internal heavy atom effect and dynamic diffusioncontrolled quenching took place. Based on the analysis of dependencies of fluorescence intensity and lifetime on the iodide ions concentration in solution, it was proposed to use the diprotonated form of the porphyrin as a basic compound for design of the fluorescent molecular receptor for the halide ions.
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Kruk et al. (2008) studied this question.
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