A novel one-dimensional spiro-like chain coordination polymer with a blue-emission signal was solvothermally synthesized via the reaction of Zn²⁺ ions with organic ligand HL (4-(4-(2-chloroimidazo[1,2-a]pyridin-3-yl)-[2,3′-bipyridin]-6-yl)benzoic acid), which is further extended to a porous three-dimensional supramolecular framework, namely, the porous coordination polymer (PCP), [Zn(L)₂]·2DMF (USTC-5). This PCP was characterized by IR spectroscopy, thermogravimetry, and single-crystal, and powder X-ray diffraction methods. USTC-5 possesses larger quasi-hexagonal channels with Lewis-base sites, and is a better CO₂ adsorption or promising CO₂/N₂ selective material, suggesting potential application in gas separation. USTC-5 also can serve as a multi-responsive sensing material for detecting Fe³⁺, Cr₂O₇²⁻, CrO₄²⁻, MnO₄⁻ and nitrobenzene (NB). Moreover, the mechanism of the selective luminescence quenching response for Cr₂O₇²⁻, CrO₄²⁻, MnO₄⁻ and NB can be mainly ascribed to the competitive adsorption of excitation wavelength energy between USTC-5 and Cr₂O₇²⁻, CrO₄²⁻, MnO₄⁻ or NB; meanwhile, Fe³⁺ ions diffused into the channels of USTC-5 and formed contacts with Lewis-base sites in USTC-5, leading to luminescence quenching. Significantly, USTC-5 displays reversible luminescence color switching in response to acid–base vapor stimuli, which originates from the conversion between the amorphous form and the crystal mediated by protonation–deprotonation processes. Such a stimuli-responsive conversion provides a promising approach to design and construct smart PCP materials.

中文翻译：

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一种新型的多孔配位聚合物揭示了Fe3 +，Cr2O72−，CrO42−，MnO4−和硝基苯的选择性感测以及刺激响应的发光颜色转换

通过Zn ²⁺离子与有机配体HL（4-（4-（2-氯咪唑并[1,2- a ]吡啶]）的反应，溶剂热合成了具有蓝色发射信号的新型一维螺旋状链状配位聚合物。-3-基）-[2,3'-联吡啶] -6-基）苯甲酸），它进一步扩展到多孔三维超分子骨架，即多孔配位聚合物（PCP），[Zn（L ）₂ ]·2DMF（USTC-5）。该PCP通过红外光谱，热重分析，单晶和粉末X射线衍射方法进行了表征。USTC-5具有较大的带有Lewis基点的准六边形通道，并且是较好的CO ₂吸附或有希望的CO ₂ / N ₂选择性材料，提示其在气体分离中的潜在应用。USTC-5也可以作为用于检测的Fe多响应感测材料³⁺，铬₂ ö ₇ ^2-，的CrO ₄ ^2-，MnO的₄ ^-和硝基苯（NB）。此外，对Cr选择性发光猝灭反应的机制₂ Ó ₇ ^2-，的CrO ₄ ^2-，MnO的₄ ^-和NB能够主要归因于激发波长能量的竞争吸附之间USTC -5-和Cr ₂ ö ₇ ^2-，的CrO ₄ ^2-，MnO的₄ ^-或NB; 与此同时，铁³⁺离子扩散到的信道USTC-5和形成的触点与路易斯碱位USTC-5 ，导致发光猝灭。值得注意的是，USTC-5响应于酸碱蒸汽刺激而显示出可逆的发光颜色切换，这源于质子-去质子化过程介导的无定形形式与晶体之间的转换。这种刺激响应转换为设计和构造智能PCP材料提供了一种有前途的方法。