十二烷基苯磺酸钠胶束中吖啶橙与罗丹明6G间的能量转移机理研究

Study on the Mechanism of Energy Transfer between Acridine Orange and Rhodamine 6G in Micelles of Dodecyl Benzene Sodium Sulfonate

以吖啶橙(AO)与罗丹明6G(R6G)为例讨论了胶束介质中碱性荧光染料间相互作用的机理。在十二烷基苯磺酸钠水溶液中,吖啶橙与罗丹明6G染料分子间相互作用发生有效能量转移。在不同温度下,通过对能量转移体系研究,初步证明吖啶橙与罗丹明6G间发生能量转移引起吖啶橙的荧光猝灭为静态猝灭过程。通过热力学参数的计算,得出能量转移体系的结合力主要为静电引力。同时也对转移体系的能量转移效率,结合位点数和结合距离进行了计算。

Applying Foerster theory, the energy transfer between acridine orange （AO） and rhodamine 6G （R6G） was investigtaed. It was found that in the solution of dodecyl benzene sulfonie acid sodium （DBS）, effective energy transfer can occur between AO and rhodamine 6G even when the concentration of the dyes is very low. The mechanism of energy transfer between AO and rhodamine 6G was studied. When the energy transfer occurs, the fluorescence of AO is quenched, the type of quenching is static. Based on the mechanism of Foerster energy transference, the thermodynamic parameters, enthalpy change （AH） and entropy change （AS）, were calculated according to Van＇t Hoff equation, which indicates the acting force between AO and R6G. The transfer efficiency of energy and the distance between AO and R6G were found. It is indicated that the course of action is single static quenching.