Unusual location of the pyrene probe solubilized in the micellar   solutions of tetraalkylammonium perfluorooctanoates

doi:10.1039/c2sm27057a

CORC > 北京大学 > 化学与分子工程学院

	Unusual location of the pyrene probe solubilized in the micellar solutions of tetraalkylammonium perfluorooctanoates
	Xing, Hang ; Yan, Peng ; Xiao, Jin-Xin
刊名	软性材料
	2013
关键词	POLYCYCLIC AROMATIC-HYDROCARBONS CONCENTRATED AQUEOUS-SOLUTIONS SODIUM DODECYL-SULFATE MIXED MICELLES PERFLUORINATED SURFACTANT FLUORESCENCE SPECTROSCOPY FLUOROCARBON MICELLES AGGREGATION BEHAVIOR ANIONIC SURFACTANTS MIXTURES
DOI	10.1039/c2sm27057a
英文摘要	The aqueous solutions of tetraalkylammonium perfluorooctanoates (C7F15COON(CnH2n+1)(4), n = 1, 2, 3, 4, abbr. TMAPFO, TEAPFO, TPAPFO, TBAPFO) were studied by steady-state and time-resolved fluorescence with pyrene as a probe, and the ammonium perfluorooctanoate (APFO) was also studied as a comparison. Unusual response of pyrene fluorescence was observed. The intensity ratio of the first and third vibronic peaks of pyrene (I-1/I-3) greatly varied with the counterions for these fluorinated surfactants after their critical micelle concentration (cmc): for TEAPFO, the I-1/I-3 abnormally increased to a value higher than that of water, while for TBAPFO the I-1/I-3 value exhibited a small extent of decease after cmc. However, no significant change of I-1/I-3 was observed during the micellization of TMAPFO and TPAPFO. The lifetime of pyrene fluorescence (tau(0)) among the systems of tetraalkylammonium perfluorooctanoates (TAAPFOs) was observed to be increased with the hydrophobicity of counterions. Moreover, the time-resolved fluorescence decay curves of pyrene for all micellar solutions exhibited single exponential decay, suggesting a single environment for pyrene, i.e. each surfactant had a single location of pyrene solubilized in its micelle. The performances of the pyrene probe in concentrated solutions of neat ammonium/tetraalkylammonium chlorides (NH4Cl/TAACls) were also investigated and an unusually high I-1/I-3 could be found for tetraethylammonium chloride. It reached a conclusion that pyrene located in the counterion layer of the TAAPFO micelles, which could be ascribed to the hydrophobic interaction and cation-pi interaction between pyrene and tetraalkylammonium ions (TAA(+)) and the immiscibility between pyrene and the fluorocarbon core.; Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Multidisciplinary; Polymer Science; SCI(E); EI; 5; ARTICLE; 4; 1164-1171; 9
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/150857]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Xing, Hang,Yan, Peng,Xiao, Jin-Xin. Unusual location of the pyrene probe solubilized in the micellar solutions of tetraalkylammonium perfluorooctanoates[J]. 软性材料,2013.
APA	Xing, Hang,Yan, Peng,&Xiao, Jin-Xin.(2013).Unusual location of the pyrene probe solubilized in the micellar solutions of tetraalkylammonium perfluorooctanoates.软性材料.
MLA	Xing, Hang,et al."Unusual location of the pyrene probe solubilized in the micellar solutions of tetraalkylammonium perfluorooctanoates".软性材料 (2013).