Synthesis, properties and fluorescence quenching in a polycation based on polyetherurethane with pyrene fluorophore
Synthesis, properties and fluorescence quenching in a polycation based on polyetherurethane with pyrene fluorophore
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DOI：
10.1016/j.jphotochem.2005.10.008
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发表时间：
2006-05-15
影响因子：
4.3
通讯作者：
Pohoata, Valentin
中科院分区：
文献类型：
--
作者：
Buruiana, Emil C.;Buruiana, Tinca;Pohoata, Valentin
以聚四氢呋喃二醇、4，w4‘-二苯基甲烷二异氰酸酯和N-甲基二乙醇胺为原料，用4-chloromethylphenylcarbamoyl-I-oxymethylpyrene部分季胺化，制备了一种软质聚氨酯，并用光谱和热分析方法对其进行了表征。附着在聚氨基甲酸乙酯主链上的芘含量为10.9wt.%聚合物。利用原子力显微镜(AFM)图像中的形貌信息，可视化了相应聚合物薄膜中纳米相分离结构域的结构。在9.65×10~(-4)M浓度下，用荧光光谱学方法研究了该聚合物的溶液性质，并用硝基苯作为有效猝灭剂，研究了该聚合物在PU-PU中的荧光猝灭。更有趣的是，由于被激发的P分子(电子给体)和硝基苯(电子受体)之间形成络合物，这种聚合物在薄膜中被饱和的硝基苯蒸气猝灭。此外，聚合物膜在清洁的大气中放置80朗姆后，荧光恢复。因为这些薄膜可能很容易被不同厚度和组成的其他薄膜覆盖，所以应该可以开发出用于检测化学分析的各种基于蒸气的“化学”传感器。(C)2005 Elsevier B.V.保留所有权利。
A soft polyurethane based on poly(tetramethylene oxide) diol, 4,w4'-diphenylmethane diisocyanate (MDI) and N-methyldiethanol amine partially quaternized with 4-chloromethylphenylcarbamoyl-I-oxymethylpyrene was prepared and characterized using spectral and thermal methods. The content of pyrene attached to the polyurethane backbone is of 10.9 wt.% polymer. The structure of the nanophase separated domains in the corresponding polymeric film was Visualized using topographical information from atomic force microscope (AFM) image. The solution properties of this polymer have been studied by fluorescence spectroscopy in tandem with the quenching- of fluorescence in the pyrene-polyurethane by nitrobenzene used as efficient quencher under a concentration of about 9.65 x 10(-4) M. Even more interestingly, a Substantial quenching was observed for such polymer in the thin film exposed to the saturated vapors of nitrobenzene as result of the formation of complex between the excited pyrene molecule (electron donor) and nitrobenzene (electron acceptor). Moreover, the fluorescence recovery from the polymeric film occurred after 80 rum of standing in a clean atmosphere. Because these films may be readily over coated with other films of varying thickness and composition, it should be possible to develop a variety of vapor-based "chemical" sensors for the detection of chemical analytics. (c) 2005 Elsevier B.V. All rights reserved.