Phosphorescence quenching of dyes adsorbed to silica thin-layer chromatography plates
Phosphorescence quenching of dyes adsorbed to silica thin-layer chromatography plates
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DOI：
10.1021/ac0511703
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发表时间：
2005-12-15
影响因子：
7.4
通讯作者：
Winnik, MA
中科院分区：
文献类型：
--
作者：
Han, BH;Manners, I;Winnik, MA
我们描述了一系列吸附在商用二氧化硅薄层色板上的过渡金属染料的氧猝灭光致发光(PL)实验。这些薄层色板已被其他人用作快速响应的发光压力传感器。猝灭动力学与SBA-15介孔二氧化硅颗粒吸附到更清晰的表面上的相同染料的行为显示出有趣的不同，SBA-15介孔二氧化硅颗粒被吸附到一层又一层的聚合物薄膜上，正如《化学》中报道的那样。马特。2005年，173160。TLC二氧化硅的孔径和孔径分布比介孔二氧化硅大得多。在硅胶薄层上，染料的荧光衰减曲线与指数形式的偏差较小。人们看到了强度和寿命之间的更大差异，最令人惊讶的是，TLC二氧化硅表面的染料对氧气猝灭的敏感度大约是前者的三倍。
We describe photoluminescence (PL) quenching experiments by oxygen for a series of transition metal dyes adsorbed to commercial silica thin-layer chromatography plates. These TLC plates have been used by others as rapidly responding PL pressure sensors. The quenching kinetics show interesting differences from the behavior of the same dyes adsorbed to the more well-defined surfaces of SBA-15 mesoporous silica particles adsorbed to a thin layer-by-layer polymer film as reported in Chem. Mater. 2005, 17, 3160. The pore size and the pore size distribution are much larger for the TLC silica than for the mesoporous silica. On the TLC silica, the dye PL decay profiles show smaller deviations from an exponential form. One sees larger differences between the intensity and lifetime Stern-Volmer plots, and most surprisingly, the dyes on the surface of the TLC silica are about three times more sensitive to quenching by oxygen.