基于异亮氨酸衍生物配体的配位聚合物的合成及其荧光应用

在溶剂热条件下，利用L-异亮氨酸衍生物配体(C₁₃H₁₉NO₃)与Zn(NO₃)₂·6H₂O合成了配位聚合物Zn₂(C₁₃H₁₇NO₃)₂]_n(1)。单晶X射线衍射结果显示化合物1结晶于单斜晶系P2₁空间群，配体与金属离子桥联形成二维层状结构，层与层间通过范德瓦耳斯力形成了三维超分子网络结构。在化合物1合成过程中加入罗丹明B(Rho-B)，可以得到复合材料2。荧光测试结果显示，在激发波长为370nm时，化合物1主要是基于配体的发光，而复合物2除配体的发光外，在580nm处出现了Rho-B的发射峰。利用配体与Rho-B发射峰相对强度的比值为检测信号，将复合物2应用于金属阳离子和挥发性有机物(VOCs)检测。实验结果显示该材料能在水溶液中选择性识别Cr³⁺离子，并且在短时间内对苯甲醛蒸气作出响应。

Synthesis and Fluorescence Applications of Coordination Polymers Based on Isoleucine-Derived Ligand

Compound Zn₂(C₁₃H₁₇NO₃)₂]_n (1) was synthesized by a traditional solvothermal method with L-isoleucine derived ligand (C₁₃H₁₉NO₃) and Zn(NO₃)₂·6H₂O as a coordination polymer. Single-crystal X-ray diffraction results show that compound 1 crystallizes in the monoclinic crystal system with the P2₁ space group. The ligands bridge the metalions to form a 2D layer structure, which further forms a 3D supramolecular network through van der Waals forces between the adjacent layers. The addition of rhodamine B (Rho-B) into the synthetic process of compound 1 leads to a composite material 2. The fluorescence test results showed that the luminescence of compound 1 was mainly based on the ligand under the excitation at 370 nm, while composite 2 showed the additional emission peak of Rho-B at 580 nm besides the ligand. Using the relative intensity ratios of emission peaks (the ligand and Rho-B) as the detection signal, composite 2 was applied to the detection of metal cations and volatile organic compounds (VOCs). The experimental results showed that the material could selectively recognize Cr³⁺ in H₂O and demonstrate a quick response to the benzaldehyde vapor.