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Synthesis, micellar structures and emission mechanisms of an AIE and DDED-featured fluorescent pH- and thermo-meter

机译：AIE和DDDed荧光pH和热仪的合成，胶束结构和排放机制

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摘要

A new nanoprobe, the luminescent diblock copolymerPNIPAM(MAh-4)-b-P4VP(PN4P), with pH- and thermo-responsive deprotonation-driven emission decay (DDED) and aggregation-induced emission (AIE) features was designed and synthesized. The nanoprobePN4Pcan form micellar structures in water with reversible dual-responsive fluorescence (FL) behavior within a wide pH range of 2-11. The critical solution temperature was found at about 32, 30 and 27 degrees C as the pH switched from 2, 7 to 11. The critical pH value of the probe was about 4.0, and the micelles showed a core-shell inversion in response to pH and thermal stimuli, accompanied by a desirable emission tunability.P4VPas the micellar shell at pH = 2 was more easily dehydrated with the increase in temperature as compared toPNIPAMas the micellar shell at pH > 4. The strongest dehydration of theP4VPshell would makePN4Pthe most strongly aggregated and the most AIE-active, which supports the 2.10-fold most distinguished thermal-responsive emission enhancement at pH = 2. Moreover, a dramatic acidochromic redshift of the emission band from 450 (pH > 4) to 490 nm (pH = 2) was observed, and the maximum emission at pH = 2 was enhanced by about 2.07-fold as compared with that at pH = 7. Therefore, the probe displays the desired dual responses and good reversibility. AIE and DDED are the two major mechanisms responsible for the dual-responsive emission change, with AIE playing a more important role than DDED. This work offers a promising approach to interpreting temperature (range from 28 to 40 degrees C) and pH changes (range from 2 to 7) in water.
机译：设计并合成了一种新的纳米孔，具有pH-和热响应的去质子化驱动排放衰减（DDed）和聚集诱导的发射（AIE）特征的发光二嵌段共聚物百置（MAH-4）-B-P4VP（PN4P）。 Nanoprocepn4PCAN在水中形成胶束结构，在宽的pH范围内具有可逆的双响应荧光（FL）行为在2-11的范围内。临界溶液温度在约32，30和27摄氏度发现随着pH从2,7切换到11.该探针的临界pH值约为4.0，并且胶束响应于pH值表现出核 - 壳反转和热刺激，伴随着所需的发射可调性。P4VPA在pH = 2时，在pH> 4比较胶束壳比较的温度下，更容易脱水.P4VPShell的最强脱水将使P4VPShell的最强脱水将成为最强烈的聚集和最强烈的聚集最阳极活跃的是，在pH = 2上支持2.10倍的最显着的热响应发射增强。此外，从450（pH> 4）到490nm（pH = 2）的发射带的显着acid acidochormic红移观察到的，并在pH = 2的最大发射被增强了约2.07倍，与在pH = 7。因此，探针显示所需双重响应和良好的可逆性相比较。 AIE和DDed是负责双响应排放变化的两种主要机制，AIE比DDED发挥更重要的作用。这项工作提供了有希望的方法来解释温度（范围为28至40℃），水在水中的pH变化（范围为2至7）。

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  • 来源
    《RSC Advances》 |2020年第40期|共11页
  • 作者

    Guo He; Cheng Xiaomeng; Li Hongping; Li Jun; Wei Jinjin; Feng Chongyang;

  • 作者单位

    Zhengzhou Univ Coll Chem Green Catalysis Ctr Zhengzhou 450001 Henan Peoples R China;

    Chinese Acad Sci Inst Chem CAS Key Lab Colloid &

    Interface &

    Thermodynam Beijing Natl Lab Mol Sci Beijing 100190 Peoples R China;

    Zhengzhou Univ Coll Chem Green Catalysis Ctr Zhengzhou 450001 Henan Peoples R China;

    Zhengzhou Univ Coll Chem Green Catalysis Ctr Zhengzhou 450001 Henan Peoples R China;

    Zhengzhou Univ Coll Chem Green Catalysis Ctr Zhengzhou 450001 Henan Peoples R China;

    Zhengzhou Univ Coll Chem Green Catalysis Ctr Zhengzhou 450001 Henan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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