1-苯胺基萘-8-磺酸盐在各种固体基质中发光特性的研究

1-苯胺基萘 - 8-磺酸盐 (ANS)在不同的固体基质中发光特性的研究发现 :(1 ) ANS分子发射峰位置与在甲醇溶液中相比 ,发生明显的蓝移 ,可能是由于约束在固体基质中的荧光分子的运动受到一定的限制而接近单分子发光的行为。与纯粉末 ANS荧光相比 ,发生红移。ANS在极性的滑石基质中 ,发射峰移向更短的波长 ,在非极性的石蜡基质中移向更长的波长 ,反映固体基质微观环境的变化。 (2 ) ANS分子荧光寿命明显缩短 ,主要原因是在固体基质中 ,荧光发射速率常数 kf 增大。 (3) ANS分子相对量子产率明显增大 ,荧光分子运动受限 ,减弱分子之间的相互作用 ,减小了由于碰撞引起的猝灭 ,分子结构刚性增强。该结果对于研究固体基质的物化性质、探讨光化学反应中能量转移现象具有重要意义。

Studies on Photol uminescence Characteristics of 1-Anilinonaphthal ene-8-Sulfonate in Solid Matrixes

The photoluminescence characteristics of 1-anilinonaphthalene-8-sulfonatein (ANS) in solid matrixes were studied.The fluorescence peak of ANS shifted to shorter wavelength in solid matrix compared with that in methanol solution, which is probably single molecular luminescence due to the limit to the motion of ANS molecules in solid environment, while the fluorescence peak of pure ANS powder shifted to longer wavelength due to the intense interaction among ANS molecules. The emission maximum in solid paraffin is the largest red shifted one due to the non-polar environments, while on the polar talcum surface there is a blue shifted one, which shows the solid microcosmic environments effects upon the properties of ANS fluorescence. Fluorescence lifetim is shortened because of the larger fluorescent emission rate in solid substrates. Relative quantum yields obviously increase due to the limit of the ANS molecules motion in solid environment, and the decrease of collision quenching. The results are important to obtain composition and physical properties of solid substrates, and significant to study the phenomenon of energy transfer in photochemical reaction.