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Fluorescent Dendritic Organogels Based on 2‐(2′‐Hydroxyphenyl)benzoxazole: Emission Enhancement and Multiple Stimuli‐Responsive Properties
Author(s) -
Chen Hui,
Feng Yu,
Deng GuoJun,
Liu ZhiXiong,
He YanMei,
Fan QingHua
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201500849
Subject(s) - benzoxazole , stacking , dendrimer , intermolecular force , fluorescence , ether , aggregation induced emission , chemistry , photochemistry , polymer chemistry , materials science , organic chemistry , molecule , physics , quantum mechanics
A new highly efficient and versatile poly(benzyl ether) dendritic organogelator HPB‐G 1 with 2‐(2′‐hydroxyphenyl)benzoxazole (HPB) at the focal point has been designed and synthesized. HPB‐G 1 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‐G 1 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.