Key Laboratory for Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105 (P.R. China).
Beijing National Laboratory for Molecular Sciences and CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190 (P.R. China), Fax: (+86) 10-62554472.
Chemistry. 2015 Jul 27;21(31):11018-28. doi: 10.1002/chem.201500849. Epub 2015 Jun 19.
A new highly efficient and versatile poly(benzyl ether) dendritic organogelator HPB-G1 with 2-(2'-hydroxyphenyl)benzoxazole (HPB) at the focal point has been designed and synthesized. HPB-G1 can form stable organogels toward various apolar and polar organic solvents. Further studies revealed that intermolecular multiple π-π stacking interactions are the main driving forces for the formation of the organogels. Notably, dendron HPB-G1 exhibited a significantly enhanced emission in the gel state in contrast to weak emission in solution. Most interestingly, these dendritic organogels exhibited multiple stimuli-responsive behaviors upon exposure to environmental stimuli, including temperature, sonication, shear stress, and the presence of anions, metal cations, acids/bases, thus leading to reversible sol-gel phase transitions.
一种新型高效、多功能的聚（苯甲醚）树枝状有机凝胶剂 HPB-G1 已被设计和合成，其核心为 2-(2'-羟基苯基)苯并恶唑（HPB）。HPB-G1 可以在各种非极性和极性有机溶剂中形成稳定的有机凝胶。进一步的研究表明，分子间的多重 π-π 堆积相互作用是形成有机凝胶的主要驱动力。值得注意的是，与在溶液中弱发射相比，树枝状分子 HPB-G1 在凝胶状态下表现出显著增强的发射。最有趣的是，这些树枝状有机凝胶在暴露于环境刺激时表现出多种刺激响应行为，包括温度、超声、剪切应力以及阴离子、金属阳离子、酸/碱的存在，从而导致可逆的溶胶-凝胶相转变。
