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首页> 外文期刊>Advanced Functional Materials >Light-Triggered Self-Assembly of a Spiropyran-Functionalized Dendron into Nano-/Micrometer-Sized Particles and Photoresponsive Organogel with Switchable Fluorescence
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Light-Triggered Self-Assembly of a Spiropyran-Functionalized Dendron into Nano-/Micrometer-Sized Particles and Photoresponsive Organogel with Switchable Fluorescence

机译：Spiropyran功能化树突的光触发自组装成纳米/微米大小的粒子和具有可切换荧光的光敏有机凝胶。

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摘要

The synthesis, self-assembly, and spectroscopic investigations of spiropyran (SP)-functionalized dendron 1 are reported. Under UV light irradiation, assembly of 1 into nano-/microparticles occurs due to the transformation of the closed form of SP into the open merocyanine (MC) form. The formation of these nano-/microparticles is confirmed by transmission electron microscopy (TEM) and dynamic light scattering (DLS) experiments in addition to the confocal laser scanning microscopy (CLSM) measurements. These nano-/ microparticles exhibit relatively strong red emission. It is interesting to note that the direct cooling of the toluene/benzene solution of 1 to 0℃ leads to gel formation. Multivalent π-π interactions due to the dendron in 1 may be the driving-force for the gelation. The UV light irradiation cannot destroy the gel phase, and in fact, the gel-gel transition is successfully realized. The purple-blue gel exhibits relatively strong red fluorescence; moreover, the fluorescence can be reversibly switched by alternating UV and visible light irradiation. The results clearly indicate that the MC form after aggregation becomes more stable and fluorescent.
机译：报道了螺吡喃（SP）-官能化的树枝状分子1的合成，自组装和光谱学研究。在紫外光照射下，由于SP的封闭形式转变为开放的花菁（MC）形式，因此将1组装成纳米/微粒。除了共聚焦激光扫描显微镜（CLSM）测量外，还可以通过透射电子显微镜（TEM）和动态光散射（DLS）实验来确认这些纳米/微粒的形成。这些纳米/微粒表现出相对强的红色发射。有趣的是，将甲苯/苯溶液直接冷却至1至0℃会导致凝胶形成。 1中的树枝状分子引起的多价π-π相互作用可能是凝胶化的驱动力。紫外线照射不能破坏凝胶相，并且实际上，成功地实现了凝胶-凝胶转变。紫蓝色凝胶显示出相对较强的红色荧光。此外，可以通过交替的紫外线和可见光照射来可逆地切换荧光。结果清楚地表明，聚集后的MC形式变得更稳定和发荧光。

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  • 来源
    《Advanced Functional Materials》 |2010年第1期|36-42|共7页
  • 作者

    Qun Chen; Yu Feng; Deqing Zhang; Guanxin Zhang; Qinghua Fan; Shuna Sun; Daoben Zhu;

  • 作者单位

    Beijing National Laboratory for Molecular Sciences CAS Key Laboratories of Organic Solids and Molecular Recognition and Function Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 (PR China) Graduate School of Chinese Academy of Sciences Beijing 100190 (PR China);

    Beijing National Laboratory for Molecular Sciences CAS Key Laboratories of Organic Solids and Molecular Recognition and Function Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 (PR China) Graduate School of Chinese Academy of Sciences Beijing 100190 (PR China);

    rnBeijing National Laboratory for Molecular Sciences CAS Key Laboratories of Organic Solids and Molecular Recognition and Function Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 (PR China);

    rnBeijing National Laboratory for Molecular Sciences CAS Key Laboratories of Organic Solids and Molecular Recognition and Function Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 (PR China);

    rnBeijing National Laboratory for Molecular Sciences CAS Key Laboratories of Organic Solids and Molecular Recognition and Function Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 (PR China);

    rnBeijing National Laboratory for Molecular Sciences CAS Key Laboratories of Organic Solids and Molecular Recognition and Function Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 (PR China);

    rnBeijing National Laboratory for Molecular Sciences CAS Key Laboratories of Organic Solids and Molecular Recognition and Function Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 (PR China);

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