新型三维Ni(II)配合物的合成、晶体结构及对水中Fe3+、CrO2-4与Cr2O2-7的检测

摘要/Abstract

摘要： 本文以3,5-吡啶二甲酸(简称3,5-H₂pdc)、1,4-双(1-咪唑基)苯(简称bib)及Ni(NO₃)₂为原料,通过溶剂热法合成出了一种新型Ni(II)配位聚合物[Ni(pdc)(bib)(H₂O)]_n(简称Ni-CP),并对其进行X射线单晶衍射、X射线粉末衍射、热重、红外光谱、荧光性能等分析研究。研究结果显示:Ni-CP属单斜晶系,空间群C2/c,其不对称单元包含1个Ni(II)、2个1/2的bib配体、1个完全去质子化的3,5-pdc^2-配体和1个配位水分子。中心Ni(II)采用六配位的方式形成NiO₃N₃的不规则八面体。bib配体和3,5-pdc^2-配体分别通过双齿配位模式μ₂-η¹∶η¹桥联和三齿配位模式μ₃-η¹∶η¹∶η¹桥联Ni(II)形成三维金属有机框架。从拓扑的角度来看,其二维框架结构可以简化为3-连接的Schläfli符号为(4·8²)拓扑结构。假如将3,5-pdc^2-配体和Ni(II)作为节点,bib配体视为连接器,三维结构可以简化为3,5-连接双节点的(4·6·8)(4·6²·8⁷)拓扑结构,孔隙率为17.4%。Ni-CP能够选择性检测出Fe³⁺、CrO^2-₄与Cr₂O^2-₇,其检测限分别为4.275×10^-5、2.681×10^-5和2.681×10^-5 mol/L,有较高的猝灭率。

关键词: 镍(II)配合物, 溶剂热法, 晶体结构, 拓扑结构, 荧光性质, 孔隙率

Abstract: A novel Ni (II) coordination polymer [Ni(pdc)(bib)(H₂O)]_n(Ni-CP) was synthesised by solvothermal method with 3,5-pyridyl dicarboxylic acid (3,5-H₂pdc), 1, 4-bis (1-imidazolyl) benzene (bib) and Ni(NO₃)₂, and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric, IR spectroscopic and fluorescence spectroscopy analysis. The results show that Ni-CP crystallized as a monoclinic system with C2/c space group. The asymmetric unit of Ni-CP was comprised of one Ni(II), two half bib ligands, one completely deprotonated 3,5-pdc^2- ligands and one coordinated water molecule. The environment around central Ni(II) can be described as irregular hexacoordination octahedral geometry of NiO₃N₃. The bib and 3,5-pdc^2- ligands were bridged by the bidentate coordination mode in the μ₂-η¹∶η¹ fashion and the tridentate coordination mode in the μ₃-η¹∶η¹∶η¹ fashion to form a three-dimensional network framework. From a topological point of view, the two-dimensional frame structure can be simplified to a 3-connected topology with a Schläfli symbol (4·8²). We consider the 3,5-pdc^2- ligands and Ni(II) as nodes and the bib ligands as connectors, forming a three-dimensional structure can be simplified to a 3,5-connected double nodes with topological symbols (4·6·8)(4·6²·8⁷). The porosity of Ni-CP is 17.4%. Ni-CP could selectively detect Fe³⁺, CrO^2-₄ and Cr₂O^2-₇ with detection limits of 4.275×10^-5, 2.681×10^-5, 2.681×10^-5 mol/L, respectively, and have a high quenching rate.

Key words: nickel(Ⅱ) complex, solvothermal method, crystal structure, topological structure, luminescence property, porosity

中图分类号:

安航宜, 黄艳嬉, 王爱荣, 王晓丽, 李家明, 史忠丰. 新型三维Ni(II)配合物的合成、晶体结构及对水中Fe³⁺、CrO^2-₄与Cr₂O^2-₇的检测[J]. 人工晶体学报, 2024, 53(9): 1599-1607.

AN Hangyi, HUANG Yanxi, WANG Airong, WANG Xiaoli, LI Jiaming, SHI Zhongfeng. A Novel Three-Dimensional Ni (II) Complex: Synthesis, Crystal Structure and Detection for Fe³⁺, CrO^2-₄ and Cr₂O^2-₇ in Water[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(9): 1599-1607.

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新型三维Ni(II)配合物的合成、晶体结构及对水中Fe³⁺、CrO^2-₄与Cr₂O^2-₇的检测

A Novel Three-Dimensional Ni (II) Complex: Synthesis, Crystal Structure and Detection for Fe³⁺, CrO^2-₄ and Cr₂O^2-₇ in Water

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