新型镉(Ⅱ)配合物荧光探针的合成及性能

摘要/Abstract

摘要： 以8-氨基喹啉、1,5-萘二磺酸根为配体,NaN₃为pH调节剂,与Cd(NO₃)₂通过水热反应,合成了一个新的一维链状镉配合物:[Cd(8-aql)₂(1,5-nd)]₂·H₂O (1)(8-aql=8-氨基喹啉, 1,5-nd=1,5-萘二磺酸根),并对其进行了元素分析、红外光谱和X-射线单晶衍射表征。配合物1属于单斜晶系,空间群为P2₁/n,不对称结构单元中包含半个Cd(Ⅱ),一个8-aql配体、半个1,5-nd阴离子和一个游离的水分子,中心离子Cd(Ⅱ)采取六配位模式构成畸变的八面体配位几何构型。该配合物具有较高的热稳定性,且在510 nm处发射荧光,属配体的π^*-π跃迁。讨论了此配合物在常见溶剂中的荧光性质。实验结果表明,不同有机小分子对配合物的发射光波长和强度均有不同程度影响,其中硝基苯使配合物荧光猝灭,该配合物可以作为荧光探针检测低浓度的硝基苯。

关键词: 镉配合物, 水热法, 晶体结构, 一维链状, 荧光探针, 硝基苯

Abstract: A new one-dimensional chain-like complex, [Cd(8-aql)₂(1,5-nd)]₂·H₂O (1)(8-aql=8-aminoquinoline, 1,5-nd=1,5-naphthalene disulfonic acidroot) was synthesized using 8-aminoquinoline and 1,5-naphthalene disulfonic acid salt as ligands and NaN₃ as pH regulator by hydrothermal reaction. And it was characterized by elemental analysis, FT-IR and single crystal X-ray diffraction. Complex 1 crystallizes in the monoclinic system with P2₁/n space group, and its asymmetric unit includes half of one Cd(Ⅱ), one 8-aql, half of one 1,5-nd and one free water molecule. In complex 1, the Cd²⁺ has a distorted octahedral coordination geometry coordinated by six atoms. Meanwhile, complex 1 shows high thermal stability under 110 ℃ and displays green fluorescence at 510 nm in the solid state. The emission peak is attributed to π^*-π of ligand due to the outermost electron of Cd²⁺ is d¹⁰. The fluorescence properties of the complex in common solvents were discussed. The experimental results show that all wavelengths of the suspension fluorescent are 10 nm to 50 nm red or blue shift and the fluorescence intensity changes obviously. The complex can be used as a fluorescent probe to detect nitrobenzene in low concentration: the linear regression equation shows that the fluorescence intensity has a good linear relationship with the concentration of nitrobenzene in the range of 6.5×10^-5 mol·L^-1 to 9.5×10^-2 mol· L^-1, and the lowest detection limit of nitrobenzene is 8.73×10^-5 mol·L^-1 according to the calculation formula of detection limit. Therefore, it can be considered that complex 1 is a potential fluorescent probe for the detection of environmental pollutants nitrobenzene with high sensitivity, low detection limit and wide linear detection range.

Key words: cadmium(Ⅱ) complex, hydrothermal method, crystal structure, one-dimensional chain-like, fluorescence probe, nitrobenzene

中图分类号:

O641.4

徐衡, 桂乃成, 严达, 熊志, 黄荣谊. 新型镉(Ⅱ)配合物荧光探针的合成及性能[J]. 人工晶体学报, 2021, 50(6): 1049-1055.

XU Heng, GUI Naicheng, YAN Da, XIONG Zhi, HUANG Rongyi. Synthesis and Properties of a Novel Cadmium(Ⅱ) Complex-Based Luminescent Probe[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(6): 1049-1055.

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