Syntheses, structures and magnetic properties of nine coordination polymers based on terphenyl-tetracarboxylic acid ligands.
Syntheses, structures and magnetic properties of nine coordination polymers based on terphenyl-tetracarboxylic acid ligands.
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DOI：
10.1039/c6dt04270h
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发表时间：
2017-01
影响因子：
4
通讯作者：
Xinhui Zhou;Qianqian Chen;Baolin Liu;Liang Li;Tao Yang;Wei Huang
中科院分区：
文献类型：
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作者：
Xinhui Zhou;Qianqian Chen;Baolin Liu;Liang Li;Tao Yang;Wei Huang
九协调聚合物(CPs) (Mn (H3L) (H2L) 0.5(苯酚的)]n (1), (Ni2L(苯酚的)2(μ氧化镁)]n (2), {[Mn2L(苯酚的)2]·(DMA) (H2O)} n (3), {[Co2L(μ氧化镁)(μ2-DMA)]·DMF} n (4), (CoL0.5 (H2O)(苯酚的)]n (5), {[Ni2L(μ氧化镁)(μ2-DMA)]·DMA} n (6), {[Co2L(μ氧化镁)(μ2-DMA)]·DMA} n (7), {[Ni2L(μ氧化镁)(H2O) 2 (DMF) 2]·(H2O) 2 (DMF)} n(8),和{[Ni4L2(μ氧化镁)4 (H2O) 2)·(H2O) 2 (NMP)} n (9) (H4L = 1, 1: 4, 1“-terphenyl-2, 4, 4”,5 '四甲酸酸,DMA = n, N-dimethylacetamine, DMF = n, N-dimethylformamide, NMP = N-methyl-2-pyrrolidone,Phen = 1,10-菲罗啉)已合成并进行了结构表征。晶体结构分析表明，1具有单节点2D（4,4）网络，双核Mn2(COO)2单元为4连接节点。3和5分别具有双核Mn2(COO)4/Co2O2单元和L4-配体作为4连接节点的双节点2D（4,4）网络。在2和8中，每个双核Ni2(COO)2（μ2-H2O）单元连接4个L4-配体，每个L4-配体连接4个双核Ni2(COO)2（μ2-H2O）单元生成三维框架，将双核Ni2(COO)2（μ2-H2O）单元作为非平面4-连接节点，将L4-配体作为平面4-连接节点，也可以将其合理化为双节点4,4-连接（42·84）（42·84）拓扑网络。在4、6-7和9中，存在一系列平行排列的金属羧酸盐链，这些链由L4-配体的对terphenyl部分沿两个方向连接形成三维框架。此外，还进行了直流磁化率测量，研究了其磁性能。在配合物2和9中，观察到磁中心之间的弱铁磁相互作用。此外，其他化合物在相邻金属离子之间表现出弱的反铁磁交换作用。
Nine coordination polymers (CPs) [Mn(H3L)(H2L)0.5(phen)]n (1), [Ni2L(phen)2(μ2-H2O)]n (2), {[Mn2L(phen)2]·(DMA)(H2O)}n (3), {[Co2L(μ2-H2O)(μ2-DMA)]·DMF}n (4), [CoL0.5(H2O)(phen)]n (5), {[Ni2L(μ2-H2O)(μ2-DMA)]·DMA}n (6), {[Co2L(μ2-H2O)(μ2-DMA)]·DMA}n (7), {[Ni2L(μ2-H2O)(H2O)2(DMF)2]·(H2O)2(DMF)}n (8), and {[Ni4L2(μ2-H2O)4(H2O)2]·(H2O)2(NMP)}n (9) (H4L = 1,1':4',1''-terphenyl-2',4,4'',5'-tetracarboxylic acid, DMA = N,N-dimethylacetamine, DMF = N,N-dimethylformamide, NMP = N-methyl-2-pyrrolidone, phen = 1,10-phenanthroline) have been synthesized and structurally characterized. Crystal structural analyses reveal that 1 features the uninodal 2D (4,4) network with the dinuclear Mn2(COO)2 units as 4-connected nodes. 3 and 5 possess the binodal 2D (4,4) network with dinuclear Mn2(COO)4/Co2O2 units and L4- ligands as 4-connected nodes, respectively. In 2 and 8, each dinuclear Ni2(COO)2(μ2-H2O) unit links to four L4- ligands and each L4- ligand bridges four dinuclear Ni2(COO)2(μ2-H2O) units to generate the 3D framework, which can also be rationalized as a binodal 4,4-connected (42·84)(42·84) topological network by considering the dinuclear Ni2(COO)2(μ2-H2O) units as non-planar 4-connected nodes and L4- ligands as planar 4-connected nodes, respectively. In 4, 6-7 and 9, there exist a series of parallel-aligned metal-carboxylate chains, which are linked along two directions by para-terphenyl moieties of L4- ligands to generate the 3D frameworks. Moreover, direct current magnetic susceptibility measurements were carried out to study their magnetic properties. In complexes 2 and 9, weak ferromagnetic interactions between the magnetic centers were observed. In addition, the other compounds show weak antiferromagnetic exchange interactions between the adjacent metal ions.