title: Fluorescent dendritic organogels based on 2-(2'-hydroxyphenyl)benzoxazole: emission enhancement and multiple stimuli-responsive properties.
abstract: 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.
authors.affiliation: 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.
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.affiliation: 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. fengyu211@iccas.ac.cn.
authors.forename: Yu
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Key Laboratory for Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105 (P.R. China).
authors.forename: Guo-Jun
authors.initials: GJ
authors.lastname: Deng
authors.affiliation: 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.
authors.forename: Zhi-Xiong
authors.initials: ZX
authors.lastname: Liu
authors.affiliation: 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.
authors.forename: Yan-Mei
authors.initials: YM
authors.lastname: He
authors.affiliation: 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. fanqh@iccas.ac.cn.
authors.forename: Qing-Hua
authors.initials: QH
authors.lastname: Fan
keywords: aggregation; dendrimers; fluorescence; multiresponsiveness; sol-gel processes; supramolecular chemistry