Two unique hybrids based on Wells–Dawson polyoxometalates, [Cu(en)₂(OH₂)]₂[{Cu(en)₂}{As₂W^V₂W^VI₁₆O₆₁}]·6H₂O (1) and (H₂dap)[Cu(H₂dap)(H₂O)₂][{Cu(dap)(H₂O)₂}{As₂W₁₇CuO₆₁}]·5H₂O (2) (en = ethylenediamine and 1,2-dap = 1,2-diaminopropane), have been synthesized hydrothermally by reaction of Na₂WO₄, NaAsO₂ and CuCl₂ with 1,2-dap or en, and further characterized by elemental analysis, infrared radiation (IR) spectrophotometry, ultraviolet (UV) spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and single crystal X-ray diffraction. In compounds 1 and 2, the emerging building blocks link into new one-dimensional (1D) chain-like Wells–Dawson architectures via two M–O–M (M = Cu/W) and O–Cu–O bridges, which are rarely observed among this arsenotungstate class. The 1D chain-like architectures further extend into 3D supramolecular frameworks through hydrogen bond interactions. They represent the first family of Dawson-type double-bridge arsenotungstate chains built from M–O–M and Cu–L linkers. Compounds 1 and 2 have exhibited electrocatalytic activity toward the reduction of nitrite. Adsorption experiments show that the compounds have the ability to selectively adsorb MB from binary mixed dye solutions (MB and MO and MB and RhB). These compounds still maintain their excellent stability and adsorption properties after several cycles.

中文翻译：

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通过M–O–M桥一步合成两个Wells-Dawson arsenotungstate杂种，以有效吸附和选择性分离有机污染物

两个基于Wells–Dawson多金属氧酸盐的独特杂化物，[Cu（en）₂（OH ₂）] ₂ [{Cu（en）₂ } {As ₂ W ^V ₂ W ^VI ₁₆ O ₆₁ }]·6H ₂ O（1）和（H ₂ dap）[Cu（H ₂ dap）（H ₂ O）₂ ] [{Cu（dap）（H ₂ O）₂ } {As ₂ W ₁₇ CuO ₆₁ }]·5H ₂ O（2）（en =乙二胺和1,2-dap = 1,2-二氨基丙烷），是通过Na ₂ WO ₄，NaAsO ₂和CuCl ₂与1,2-dap或en反应水热合成的，并进一步通过元素表征分析，红外辐射（IR）分光光度法，紫外（UV）光谱，热重分析（TGA），X射线光电子能谱（XPS）和单晶X射线衍射。在化合物1和2，新兴的积木链接到新的一维（1D）连锁井道森架构经由两条M–O–M（M = Cu / W）和O–Cu–O桥，在这种准钨酸盐类中很少见到。1D链状架构通过氢键相互作用进一步扩展到3D超分子框架中。它们代表了由M–O–M和Cu–L接头构建的Dawson型双桥Arsenotungstate链的第一个家族。化合物1和2显示出对亚硝酸盐还原的电催化活性。吸附实验表明，该化合物具有从二元混合染料溶液（MB和MO以及MB和RhB）中选择性吸附MB的能力。这些化合物在几个循环后仍保持其优异的稳定性和吸附性能。