衍生于三苯基吡啶的pH探针的制备及其光谱性质

Preparation and Spectroscopic Properties of pH Probe Derived from Trisphenylpyridine

由4-氯苯甲醛、苯乙酮和氨在氢氧化钠溶液中一锅法合成了化合物4-(4-氯苯)-2,6-二苯基吡啶(Ⅰ),用1HNMR、13CNMR和FTIR对化合物Ⅰ进行了结构表征。pH滴定实验表明,化合物Ⅰ的紫外吸收和荧光发射光谱均对溶液的pH具有较强的敏感性,当溶液pH=4.70～4.22,化合物Ⅰ在256 nm的紫外吸收强度随着pH的减小而降低,在312 nm的紫外吸收强度及在403 nm的荧光强度随着pH的减小而增强。此外,热分析结果表明,化合物Ⅰ具有优良的热稳定性。

The compound 4-（ 4-chlorophenyl ）-2, 6-diphenylpyridine was synthesized by one-pot reaction in potassium hydroxide and aqueous ammonia solution from 4-chlorobenzaldehyde and acetophenone. The title compound was characterized by means of ^1HNMR,^13CNMR and FTIR（ Fourier transform infrared spectroscopy ）. The pH titration indicates that the title compound was extremely sensitive to pH in absorption spectra and fluorescence spectra. The absorption intensities at 256 nm decreased upon pH variation from 4.70 to 4.22. In the mean time, both the absorption intensities at 312 nm and the emission intensities at 403 nm gradually increased. The thermal property of the title compound was also measured and high thermal stability was identified.