三苯胺-PAMAM树枝分子的单/双光子荧光增强  

One/two-photon fluorescence enhancement of dendrimer TBA-PAMAM

作　　者：贾美琳[1] 王筱梅[1,2,3] 张唯舟[2,3] 杨平[1] 王晓宏[2,3] 罗建芳[2,3] 

机构地区：[1]苏州大学材料与化学化工学部,江苏苏州215123 [2]苏州科技学院江苏省环境功能材料重点实验室,江苏苏州215009 [3]苏州科技学院苏州市环境功能材料重点实验室,江苏苏州215009

出　　处：《功能材料》2011年第6期1137-1141,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50673070;50973077;50973077;20673075);教育部科技重点资助项目(204053);苏州市科技发展资助项目(SYJG0931)

摘　　要：合成了新的发光分子——4-N,N-二苯基氨基苯甲酸琥珀酰亚胺(简称TBA-SCM),利用其琥珀酰亚胺基与PAMAM所含的氨基之间高度反应活性,将三苯胺甲酰基组装键合在树枝分子PAMAM(0～3G)表面,构筑新的树枝分子TBA-PAMAM。研究表明,在稀溶液(10-6)下未观测到TBA-PAMAM的荧光增强现象;当浓度增大至10-4时,按1∶1的配比组装数秒后即可检测到显著的荧光增强。光谱测试证实,这是由于该浓度下PAMAM聚集态的发光带与TBA-SCM发光带发生部分重叠促进两者之间有效的电荷转移所致。荧光衰减曲线拟合结果表明,TBA-PAMAM(0G,3G)有两个寿命,长寿命对应着PAM-AM(0～3G),短寿命则是TBA-PAMAM(0G,3G)树枝状结构。随着TBA-SCM的增大,TBA-PAMAM(0G,3G)的单光子荧光急剧降低直至完全淬灭,但双光子荧光强度则显著增高。A new chromophore,named as 4-（diphenylamino）benzoic acid succinimide（TBA-SCM）,was synthesized and bonded to dendrimer PAMAM（0-3G） in order to obtain the new dendrimer（TBA-PAMAM）.The fluorescence enhancements of TBA-PAMAM（0-3G） were observed at the concentration of =1×10-4mol/dm3.Absorption and fluorescence spectra confirmed that the emission band of PAMAM aggregation was overlapped with that of TBA-SCM and resulting has contribution to fluorescence enhancement effect.Moreover,an instantaneous enhancement（about several second） of fluorescence was readily achieved,which showed a potential application for fluorescence image and sensors.Fluorescence decay curves reveal that there are two values of lifetime within TBA-PAMAM system,where the longer lifetime（τ1） corresponds to PAMAM,while the short one（τ2） is attributed to the species TBA-PAMAM.It was found that with the increase of amount of TBA-SCM,one-photon fluorescence of TBA-PAMAM（0G,3G） was almost quenched,their two-photon fluorescence,however,was significantly enhanced.With more TBA-dipole,dendrimer of TBA-PAMAM（0G,3G） possesses large charge-transfer and resultant shows strong two-photon fluorescence.

关 键 词：TBA-PAMAM树枝分子 TBA-SCM 快速荧光增强 双光子荧光增强 

分 类 号：O64[理学—物理化学]