The fluorescence properties of coumarine dye intercalated in a swelling clay
The fluorescence properties of coumarine dye intercalated in a swelling clay
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溶胀粘土中香豆素染料的荧光特性
DOI：
10.1016/0022-3697(89)90409-5
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
M. Shimada
中科院分区：
文献类型：
--
作者：
T. Endo;N. Nakada;Tsugio Sato;M. Shimada
研究了香豆素类染料在膨润土中的荧光性质。粘土-香豆素复合物的制备如下进行：将膨胀粘土加入并充分混合到含有相应量的香豆素的水溶液中。接着，将所得悬浮液在室温下干燥12小时以制备膜状粘土-香豆素复合物。热重-差热分析和X射线衍射数据表明，香豆素分子可以固定在膨润土的层间，并在约75 °C的熔融温度下保持热稳定。此外，随着嵌入香豆素量的增加，在13.0 - 18.5 A之间观察到明显的基底间距的阶梯式变化。这种几何形状的变化的平面形状的香豆素发色团显着影响的荧光性质。在480 nm附近的荧光的量子效率进行了讨论与浓度猝灭。此外，香豆素发色团中N原子的电荷稳定性解释了发射峰的红移。
The fluorescence properties of coumarine dye incorporated into swelling clays were studied. Preparation of the clay-coumarine composite was carried out as follows: a swelling clay was added and mixed intimately into the water solution containing the corresponding quantity of coumarine. Next, the resulting suspension was dried for 12 h at room temperature for making a filmy clay-coumarine composite. The TG-DTA and the X-ray diffraction data showed that the coumarine molecules could be immobilized and thermally stabilized at the melting temperature ofca75°C in the interlayers of the swelling clay. In addition, as the quantity of intercalated coumarine increased, a pronounced stepwise change was observed in the basal spacings from 13.0 to 18.5 A. Such a geometric change of the flat-shaped coumarine chromophore significantly influenced the fluorescence properties. The quantum efficiency of fluorescence near 480 nm is discussed in connection with concentration quenching. Also, the red shift of the emission maximum was elucidated by the charge stability ofNatoms in the coumarine chromophore.