Two POM-based copper coordination polymers constituted by Keggin-type polyoxometalates (POMs), [Cu 2 (SiW 12 O 40 ) 2 (Fbtx) 3 (H 2 O) 4 ] n ( 1 ) and {[Cu 2 (SiW 12 O 40 ) (Fbtx) 2 (H 2 O) 2.75 ]·4.5H 2 O} n ( 2 ) (Fbtx = 2,3,5,6-tetrafluoro-1,4-bis (1,2,4-triazole-1-ylmethyl)benenze) have been hydrothermally synthesized by the same precursor at different pH values and structurally characterized by single-crystal X-ray diffraction, powder X-ray diffraction, element analyses and IR. Both of them have two-dimensional coordination layers constructed by bidentate SiW 12 O 40 4− anions and bridging Fbtx ligands, in which complex 1 exhibits a 2D + 2D → 2D interpenetrated network with sql topology, while complex 2 features a binodal 3,5-connected network bearing new topology with a Schläfli symbol of {4 4 ;6 6 }{6 2 ;10}. Additionally, the thermal stability, fluorescent properties and photocatalytic properties of complexes 1 and 2 have also been investigated. The results indicate that complexes 1 and 2 can serve as recyclable heterogeneous photocatalysts and show good catalytic activity for the degradation of Rhodamine B under UV irradiation.

中文翻译：

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两种基于 POM 的无机-有机杂化铜配位聚合物的 pH 控制组装：合成、结构和性能

两种基于 POM 的铜配位聚合物由 Keggin 型多金属氧酸盐 (POM)、[Cu 2 (SiW 12 O 40 ) 2 (Fbtx) 3 (H 2 O) 4 ] n ( 1 ) 和 {[Cu 2 (SiW 12 O 40 ) (Fbtx) 2 (H 2 O) 2.75 ]·4.5H 2 O} n ( 2 ) (Fbtx = 2,3,5,6-四氟-1,4-双(1,2,4-三唑) -1-基甲基）苯）已由相同的前体在不同的 pH 值下水热合成，并通过单晶 X 射线衍射、粉末 X 射线衍射、元素分析和红外光谱进行结构表征。它们都具有由双齿 SiW 12 O 40 4− 阴离子和桥接 Fbtx 配体构成的二维配位层，其中配合物 1 表现出具有 sql 拓扑的 2D + 2D → 2D 互穿网络，而配合物 2 具有双节点 3,5 - 连接的网络承载新的拓扑结构，带有 {4 4 ;6 6 }{6 2 ;10} 的 Schläfli 符号。此外，还研究了配合物 1 和 2 的热稳定性、荧光性能和光催化性能。结果表明，配合物1和2可以作为可回收的多相光催化剂，在紫外光照射下对罗丹明B的降解表现出良好的催化活性。