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首页> 外文期刊>Polymers for advanced technologies >Formation of nano-dots of phenylazomethine dendrimers with Rhodamine 6G on mica
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Formation of nano-dots of phenylazomethine dendrimers with Rhodamine 6G on mica

机译：罗丹明6G在云母上形成苯基偶氮甲碱树枝状聚合物的纳米点

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摘要

The phenylazomethine dendrimer (DPA) is associated with Rhodamine 6G in chloroform, which results in the chemical shift attributed to the aromatic protons of phenylazomethine being moved upfield in the 1{sup left}H-NMR spectrum by increasing the Rhodamine 6G. The shift is saturated at the ratio of 1:1. On the basis of the NMR analysis, the association constant K of phenylazomethine with Rhodamine 6G was determined to be 1.4 × 10{sup}4 (l/mol) in CDCl{sub}3 at 20℃. The association is also confirmed by UV-vis spectroscopy, in which the absorption around 450 and 527 nm changes during the addition of Rhodamine 6G. The fluorescence intensity of the 1:1 complex of Rhodamine 6G and DPA G4 is stronger than that of the solution dissolved only in Rhodamine 6G at greater than 1 mM though it is generally known that the intermolecular interaction quenches the dye fluorescence in a concentrated solution. The association of DPA G4 with Rhodamine 6G suppresses the quenching at higher concentrations. Homogenous nano-dots were observed on mica by casting the DPA G4 complex with Rhodamine 6G, in which the height and average area were 1.5-3 nm and 1.6 × 10{sup}3 nm{sup}2 (the standard deviation a = 3.7 nm{sup}2), respectively. Copyright.
机译：苯偶氮甲碱树枝状聚合物（DPA）与氯仿中的若丹明6G缔合，这导致化学位移归因于苯偶氮甲碱的芳族质子通过增加若丹明6G在1H-NMR光谱中向高处移动。位移以1：1的比例饱和。根据NMR分析，在20℃下，在CDCl {sub} 3中，苯偶氮甲胺与若丹明6G的缔合常数K为1.4×10 {sup} 4（l / mol）。紫外-可见光谱也证实了这种缔合，其中在添加罗丹明6G的过程中，在450和527 nm附近的吸收发生了变化。罗丹明6G和DPA G4的1：1配合物的荧光强度比仅溶解于若丹明6G中大于1 mM的溶液的荧光强度要强，尽管通常已知分子间的相互作用会猝灭浓缩溶液中的染料荧光。 DPA G4与若丹明6G的结合抑制了更高浓度下的猝灭。通过用罗丹明6G浇铸DPA G4复合物，在云母上观察到同质的纳米点，其中高度和平均面积为1.5-3 nm和1.6×10 {sup} 3 nm {sup} 2（标准偏差a = 3.7 nm {sup} 2）。版权。

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