A hydrogen-bonded organic framework containing fluorescent carbazole and responsive pyridyl units for sensing organic acids  

作　　者：Liangji Chen Zhen Yuan Fudong Feng Xin Zhou Zhile Xiong Wuji Wei Hao Zhang Banglin Chen Shengchang Xiang Zhangjing Zhang 

机构地区：[1]Fujian Key Laboratory of Polymer Materials,College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350007,China

出　　处：《Chinese Chemical Letters》2024年第9期458-463,共6页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22271046,21971038,21975044);the Fujian Provincial Department of Science and Technology(No.2019L3004);the Foundation of National Key Laboratory of Human Factors Engineering(No.HFNKL2023W04)。

摘　　要：Hydrogen-bonded organic frameworks(HOFs)are a promising candidate for optical sensing,but the lack of effective design strategies poses significant challenges to the construction of HOFs for organic acid sensing.In this work,the first HOF for organic acid sensing is reported by constructing a multiplepyridine carbazole-based dense HOF,namely HOF-FJU-206,from a tripyridine-carbazole molecular 3,6-bis(pyridin-4-yl)-9-(4-(pyridin-4-yl)phenyl)-9H-carbazole(CPPY)with carbazole center for luminescence,pyridyl sites for its responsive of hydrogen proton,and narrow channels in the dense framework for the diffusion of hydrogen protons.HOF-FJU-206 exhibits differential responsively fluorescence sensing and recovery properties to formic,acetic,and propionic acids with different molecular sizes and p Kavalue(acid dissociation constant).The dissociation degree of various acids can be determined by analyzing the slope of changes in both peak wavelength and intensity of in-situ fluorescence,which easily enables the dual-corrective recognition of different acids.The varying degree of protonation at pyridine sites is proved to be the reason for differential sensing of various acids,as demonstrated by1H NMR spectra,X-ray photoelectron spectroscopy(XPS)characterization,and modeling studies.

关 键 词：Hydrogen-bonded organic framework Organic acid sensing Acids recognition Carbazole luminescence Pyridine protonation 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] O641.2[自动化与计算机技术—控制科学与工程]