反相胶束介质中敏化双乙酰室温燐光——α-萘乙酸为敏化剂  

Sensitized Biacetyl Room Temperature Phosphorescence in AOT Reversed Micelles

作　　者：谢剑炜 许金钩[1] 陈国珍[1] 

机构地区：[1]厦门大学化学系,厦门361005

出　　处：《化学学报》1995年第10期952-957,共6页Acta Chimica Sinica

摘　　要：本文报道了AOT-C_6H_(12)-H_2O反相胶束介质中α-萘乙酸(α-NAA)敏化双乙酰(BIAC)的室温燐光.详细讨论了琥珀酸二(2-乙基己基)酯磺酸钠(AOT)浓度和水泡大小(W值)对敏化燐光的影响.吸收、发光性质和微粘度性质的实验表明AOT浓度对敏化燐光强度的影响由敏化燐光寿命、能量转移效率和Poisson分布决定;一定范围内,随着水浓度增大,由于粘度下降和内腔半径增大作用的相互抵销,水泡大小仅有微弱影响.当W([H_2O]/[AOT])大于20后,内腔半径增大起主要作用,敏化燐光强度快速下降.与普通SDS胶束相比,燐光强度约增强13倍,检出限约下降一个数量级.建立了灵敏的测定α-萘乙酸和双乙酰的敏化室温燐光法,检出限分别达2.0×10^(-8)mol·dm^(-3)(α-NAA)和8.5×10^(-9)mol·dm^(-3)(BIAC).Sensitized biacetyl Room Temperature Phosphorescence by a-Naphthylacetic acid in reversed micelles of AOT-C6H12-H2O is presented. The intensity of biacetyl RTP is enhanced about 13 times than the intensity observed in aqueous SDS micelles. Parameters including the concentrations of AOT, solubilized water as well as donor and accepter concentration that may influence the sensitized biacetyl phosphorescence are also examined. The absorption spectra and characteristics of luminescence as well as micro viscosity data are used to elucidate the factors that affect sensitized phosphorescence. The intensity of sensitized biacetyl phosphorescence in AOT reversed micelles is determined by the lifetime of sensitized biacetyl, energy transfer efficiency and the Poisson distribution. No remarkable influence of water content on the intensity of sensitized biacetyl phosphorescence is observed at W([H2O] / [AOT]) less than 20 because the effects of both decreasing in micro viscosity and increasing in radius of inner core of reversed micelles offset each other. The decreasing in sensitized biacetyl RTP is observed at W more than 20. The detection limits for α-naphthylacetic acid and biacetyl are 2.0 ×10-8mol·dm-3 and 8.5 x 10-9mol·dm-3, respectively.

关 键 词：反相胶束 敏化室温Lin光 萘乙酸 双乙酰 

分 类 号：O644.1[理学—物理化学] O657.3[理学—化学]