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Synthesis, Structure and Magnetic Studies of a Ni(II) Coordination Polymer Constructed from Asymmetrical Tetracarboxylic Acid and N-Donor Ligand
Journal of Cluster Science ( IF 2.7 ) Pub Date : 2021-05-21 , DOI: 10.1007/s10876-021-02088-3
Mei-Rong Han , Xiao-Jie Kong , Si-Si Feng , Li-Ping Lu

One new tri-nuclear nickel(II) coordination polymer, namely, [Ni3(μ3-O)(as-H2bptc)2(4,4′-bpy)2(H2O)4]n (H4bptc = 2,3,3′,4′-biphenyl tetracarboxylic acid, and 4,4′-bpy = 4,4′-bipyridine) has been synthesised under hydrothermal conditions, and its structure and properties have been characterised by X-ray single-crystal and powder diffraction, infrared spectrum analysis, elemental analysis, thermogravimetric analysis and magnetic susceptibility analysis. The single-crystal diffraction results showed that complex crystallised in the C2/c monoclinic space group was a 3D structure with tri-nuclear Ni(II) secondary building units, in which metal cations were in octahedral coordination geometries. The powder X-ray diffraction indicated that the complex was a pure phase and thermal analysis showed the excellent thermal stability of the complex. Additionally, variable temperature (2–300 K) magnetic measurements indicated antiferromagnetic coupling or spin inclination behaviour in the Ni3 core in the complex.



中文翻译:

由不对称四羧酸和N-供体配体构成的Ni(II)配位聚合物的合成,结构和磁性研究

一个新的三核镍(II)的配位聚合物,即,[倪3μ 3 -O)(-H 2 BPTC)2(4,4'-联吡啶)2(H 2 O)4 ] Ñ(H在水热条件下合成了4 bptc = 2,3,3',4'-联苯四羧酸和4,4'-bpy = 4,4'-联吡啶),其结构和性质已通过X-射线单晶和粉末衍射,红外光谱分析,元素分析,热重分析和磁化率分析。单晶衍射结果表明,络合物在C 2 /中结晶。c单斜空间群是具有三核Ni(II)二级构造单元的3D结构,其中金属阳离子呈八面体配位几何形状。粉末X射线衍射表明该配合物是纯相,热分析表明该配合物具有优异的热稳定性。此外,可变温度(2–300 K)的磁性测量结果表明,复合物中Ni 3芯中存在反铁磁耦合或自旋倾斜行为。

更新日期:2021-05-22
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