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Eu-Based Phosphorescence Lifetime Polymer Nanothermometer: A Nanoemulsion Polymerization Approach to Eliminate Quenching of Eu Emission in Aqueous Media
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-01-06 , DOI: 10.1021/acsapm.9b00952
Julia R. Shakirova 1 , Natalia N. Shevchenko 2 , Vadim A. Baigildin 1 , Pavel S. Chelushkin 1 , Alexander F. Khlebnikov 1 , Olesya A. Tomashenko 1 , Anastasia I. Solomatina 1 , Galina L. Starova 1 , Sergey P. Tunik 1
Affiliation  

In this work, we report on the synthesis of the two highly thermosensitive Eu complexes ([(tta)3Eu(NN1)] (Eu1) and [(tta)3Eu(NN2)] (Eu2), where tta is thenoyltrifluoroacetone, NN1 is 3-phenyl-2-(pyridin-2-yl)pyrido[2,1-a]pyrrolo[3,2-c]isoquinoline, and NN2 is 1-phenyl-2-(pyridin-2-yl)-1H-phenanthro[9,10-d]imidazole), and preparation of luminescent thermosensitive nanomaterial (latex nanothermometer, LNT). LNT design and preparation were based on the application of Eu2 and copolymerization of butyl and methyl methacrylates in the presence of the complex, surfactant (cetyltrimethylammonium bromide), and cosurfactant (acetone). Optimization of nanoemulsion polymerization conditions allowed us to obtain strongly luminescent nanoparticles with a narrow size distribution (D = 75 nm; PDI = 0.05). Moreover, the resulting LNT particles feature nonuniform distribution of Eu2, which localizes mainly inside the nanoparticles while the outer layer lacks the complex. As a result, the developed LNT demonstrates monoexponential luminescence decays with a lifetime temperature sensitivity up to 0.84%/K and resolutions of 0.26 K comparable to or exceeding existing analogues together with complete reversibility in cycling experiments.

中文翻译:

基磷光寿命聚合物纳米温度计:一种纳米乳液聚合方法,消除了水介质中Eu的猝灭

在这项工作中,我们报告了两种高度热敏Eu配合物([(tta)3 Eu(NN1)](Eu1)和[(tta)3 Eu(NN2)](Eu2)的合成,其中tta是壬基三氟丙酮, NN1为3-苯基-2-(吡啶-2-基)吡啶并[2,1- a ]吡咯并[3,2- c ]异喹啉,而NN2为1-苯基-2-(吡啶-2-基)- 1H-菲并[9,10-d]咪唑),发光热敏纳米材料的制备(胶乳纳米温度计,LNT)。LNT的设计和制备基于Eu2的应用在配合物,表面活性剂(十六烷基三甲基溴化铵)和助表面活性剂(丙酮)存在下共聚甲基丙烯酸丁酯和甲基丙烯酸甲酯。纳米乳液聚合条件的优化使我们能够获得具有窄尺寸分布(D = 75 nm; PDI = 0.05)的强发光纳米颗粒。此外,所得的LNT颗粒具有Eu 2的不均匀分布,Eu 2的分布主要位于纳米颗粒内部,而外层缺乏复合物。结果,开发的LNT证明了单指数发光衰减,寿命温度敏感性高达0.84%/ K,分辨率为0.26 K,可与现有类似物媲美或超过现有类似物,并且在循环实验中具有完全可逆性。
更新日期:2020-01-06
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