Lv Yuanchao, Liang Jiashuai, Li Delin, Xiong Zhile, Cai Kaicong, Xiang Shengchang, Zhang Zhangjing
Fujian Provincial Key Laboratory of Polymer Materials, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China.
Inorg Chem. 2022 Nov 21;61(46):18789-18794. doi: 10.1021/acs.inorgchem.2c03341. Epub 2022 Nov 9.
Developing smart stimuli-responsive metal-organic frameworks (MOFs) with diversified induced readable signals is highly desirable; however, reported multimode responsive MOFs are always achieved under strong environmental stimulations, making it difficult to keep MOF structures stable for practical applications. Herein, we reported a hydration-facilitated coordination tuning strategy to achieve the dual-mode water response in fluorescence and proton conduction from a single MOF. The designed MOF permitted reversible single-crystal transformation via the controllable hydration effect on metal nodes. The change in coordination modes leads to the regulation on conformations of optical ligands, contributing to the switch of fluorescence emissions. Moreover, the hydration effect adds additional hydrogen-bond sites in channels and optimizes hydrogen-bond networks, abruptly enhancing the proton conductivity by ∼20 times. These results pave new avenues for the exploitation of smart MOFs with multimode responsive behavior for on-demand sensing/detection applications.
开发具有多样化诱导可读信号的智能刺激响应性金属有机框架（MOF）是非常可取的；然而，已报道的多模式响应性MOF总是在强烈的环境刺激下实现的，这使得MOF结构在实际应用中难以保持稳定。在此，我们报道了一种水合促进的配位调节策略，以实现单一MOF在荧光和质子传导方面的双模式水响应。所设计的MOF通过对金属节点的可控水合作用允许可逆的单晶转变。配位模式的变化导致对光学配体构象的调节，有助于荧光发射的切换。此外，水合作用在通道中增加了额外的氢键位点并优化了氢键网络，使质子传导率突然提高了约20倍。这些结果为开发具有多模式响应行为的智能MOF用于按需传感/检测应用开辟了新途径。
