Abstract Three crystalline supramolecular polymers (SPs), [(TCPSBF)·(C4H8O2)3]n (intermediate), [(TCPSBF)·(C4H8O2)2]n (UPC-S3) and [(TCPSBF)0.5]n (UPC-S4), were constructed by solvent diffusion method based on 2,2′,7,7′-tetrakis(4- cyanophenyl)-9,9′-spirobi-[9H-fluorene] (TCPSBF). Interestingly, single crystal diffraction and PXRD analyses display the solvent-induced single-crystal-to-single-crystal (SCSC) transformation among three SPs. The unstable intermediate crystal gradually changes to UPC-S3 with the loss of a lattice dioxane molecule at room temperature, and UPC-S3 may be further transformed into UPC-S4 with the loss of the other two lattice dioxane molecules by solvent soaking. Meanwhile, the intermediate crystal can also be directly transformed into UPC-S4 by solvent soaking. As a result, UPC-S4 exhibits highly thermal and chemical stability. The fluorescent spectrum tests show that UPC-S4 possesses potential applications not only in the detecting of small molecules including n-hexane and nitroaromatic derivatives, but also in selective sensing of Fe3+.

中文翻译：

---

基于螺二芴的超分子聚合物：溶剂诱导的 SCSC 转化和荧光传感

摘要 三种结晶超分子聚合物 (SPs), [(TCPSBF)·(C4H8O2)3]n (中间体), [(TCPSBF)·(C4H8O2)2]n (UPC-S3) 和 [(TCPSBF)0.5]n (UPC) -S4)，通过基于 2,2',7,7'-四(4-氰基苯基)-9,9'-螺双-[9H-芴] (TCPSBF) 的溶剂扩散法构建。有趣的是，单晶衍射和 PXRD 分析显示了三个 SP 之间溶剂诱导的单晶到单晶 (SCSC) 的转变。不稳定的中间体晶体在室温下逐渐转变为UPC-S3，失去一个晶格二恶烷分子，UPC-S3可以通过溶剂浸泡进一步转变为UPC-S4，失去另外两个晶格二恶烷分子。同时，中间体晶体也可以通过溶剂浸泡直接转化为UPC-S4。因此，UPC-S4 具有高度的热稳定性和化学稳定性。荧光光谱测试表明UPC-S4不仅在检测小分子包括正己烷和硝基芳香衍生物方面具有潜在的应用，而且在Fe3+的选择性传感方面也具有潜在的应用价值。