Photomodulated Morphologies in Halogen Bond–Driven Assembly during Gel–Sol Transition,Macromolecular Rapid Communications

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Photomodulated Morphologies in Halogen Bond–Driven Assembly during Gel–Sol Transition
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2018-10-22 , DOI: 10.1002/marc.201800629
Haisi Hu ₁ , Yuan Qiu ₁ , Jing Wang ₁ , Dongxu Zhao ₁ , Hong Wang ₁ , Qin Wang ₁ , Yonggui Liao ₂ , Haiyan Peng ₁ , Xiaolin Xie ₂

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Photoresponsive supramolecular gels with various applications are being constantly pursued; however, achieving well‐defined morphology changes of gels via light irradiation remains a formidable challenge. In this study, a gel is prepared through halogen bond between azopyridine‐containing Azopy‐C10 and 1,4‐tetrafluorodiiodobenzene. The gel exhibits gel–sol transition due to trans–cis isomerization of the azopyridine moiety upon UV irradiation. During this transition, the morphologies vary from flake to fluffy bobble‐like and finally to peony‐like with increasing exposure time, which is difficult to achieve in traditional assembly systems. The microstructure change is attributed to the variations of cis‐isomer content and halogen‐bonding strength. The supramolecular gel provides a novel method to achieve photomodulated morphologies and broadens the applications of such kind of materials, ranging from information storage to high‐tech anticounterfeit.

中文翻译：

凝胶-溶胶转变过程中卤素键驱动组装中的光调制形态

不断追求具有各种应用的光响应性超分子凝胶。然而，通过光照射实现凝胶形态学的明确定义仍然是一个艰巨的挑战。在这项研究中，通过含偶氮吡啶的Azopy-C10与1,4-四氟二碘苯之间的卤素键制备了一种凝胶。由于偶氮吡啶部分在紫外线照射下反式-顺式异构化，因此凝胶显示出凝胶-溶胶转变。在这种过渡过程中，随着暴露时间的增加，形态从薄片状变为蓬松的泡泡状，最后变为牡丹状，这在传统的装配系统中很难实现。微观结构的变化归因于顺式异构体含量和卤素键强度的变化。

更新日期：2018-10-22

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