Abstract: The fluoride-responsive organogels, the recognization and combination of the gelators with fluoride anions through hydrogen bonding will induce the red shift of UV absorption wavelength and then the change of color, realizing the colorimetric response. At the same time, the main driving force of gel formation is destroyed, and the gel-sol transition is induced to achieve the state response. The fluoride-responsive organogels capable of responding to external fluoride anions show obvious advantages in fluoride anion detection, because the convenient and quick detection by naked eyes, and the detection of fluoride anions to quasi solid can be realized. Therefore, the fluoride-responsive organogels have attracted more and more attention. It has been reported that many fluoride-responsive organogels only hold single response mode to fluoride anions. Specifically speaking, the addition of fluoride anions can only induce the gel-sol transition and fail to induce color change of the system, or it only bring about color change of the system rather than the gel-sol transition. Accordingly, the fluoride-responsive organogels capable of both response modes, namely presenting gel-sol transition and color changes, to fluoride anions are superior in fluoride detection. Up to now, the researches on fluoride-responsive organogels with dual response modes to fluoride anions have been reported. Most researches focus on organogels based on intermolecular hydrogen bonding, their gelators contain functional groups like amide, hydrazone, urea, hydrazine, and so forth, and the main driving force for the formation of organogels lies in intermolecular hydrogen bonding interaction. Thanks to the strong electronegativity of fluoride anions, the deprotonation of gelators will take place, resulting in the destruction or color change of the organogels. Consequently, the response mechanism of fluorine ions primarily consists of hydrogen bonding interaction and deprotonation process. However, the responsive process of fluoride anions and gelators are quite different in various systems, which is not only directly related to the type of hydrogen bond provided by the gelators, but also affected by the conjugated groups, the nature and location of the substituents. Therefore, a comprehensive summary concerning the fluorine-responsive organogels is necessary. Based on this, combining with the recent research results of our group on fluoride-responsive organogels, we summarize the fluoride-responsive organogels reported in the literatures in recent years, especially the organogel systems which showed both reversible color change and gel-sol transition by fluoride anions stimuli, for the sake of providing some references for molecular design of the organogels with fluoride anions response.
韦学玉, 杨晓凡, 白炳莲, 徐晓平, 李济源, 刘志刚. 对氟离子呈现状态和比色响应的有机凝胶的研究进展[J]. 材料导报, 2019, 33(9): 1583-1594.
WEI Xueyu, YANG Xiaofan, BAI Binglian, XU Xiaoping, LI Jiyuan, LIU Zhigang. Advances in Organogels with State and Colorimetric Response to Fluoride. Materials Reports, 2019, 33(9): 1583-1594.
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