Three Co(II) metal–organic frameworks (Co-MOFs) build by 4,4′-bis(imidazolyl)diphenyl ether (bidpe), m-Phthalic acid (H₂mpa), 5-Nitroisophthalic acid (H₂nmpa) and 5-sulfonatobenzene-1,3-dicarboxylate (H₂smpa), namely: [Co(mpa)(bidpe)]_n (1), [Co(nmpa)(bidpe)]_n (2), {[Co_1.5(smpa)(bidpe)₂]·1.5H₂O·0.25DMA}_n (3), were synthesized under same solvothermal condition. The compounds have been characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, thermogravimetric (TG) analysis and powder X-ray diffraction (PXRD). The single-crystal X-ray diffraction analysis reveals that compound 1 shows a 4-connected sql net with Schläfli point symbol (4⁴·6²). Compound 2 displays a 3, 5-connected net with Schläfli point symbol (4²·6⁷·8)(4²·6). Compound 3 possesses a 3-connected net with Schläfli point symbol (4²·6). The photocatalytic investigations indicate that compounds 1–3 afford good photocatalytic capabilities in degradation of methylene blue (MB) and methylene violet (MV). Furthermore, the possible photocatalytic mechanisms have been discussed.

由4,4'-双（咪唑基）二苯醚（bidpe），间苯二甲酸（H ₂ mpa），5-硝基间苯二甲酸（H ₂ nmpa）构建的三个Co（II）金属-有机骨架（Co-MOF ）和5-磺基苯-1,3-二羧酸酯（H ₂ smpa），即：[Co（mpa）（bidpe）] _n（1），[Co（nmpa）（bidpe）] _n（2），{[Co _1.5（smpa）（bidpe）₂ ]·1.5H ₂ O·0.25DMA} _n（3在相同的溶剂热条件下合成。通过元素分析，红外光谱，单晶X射线衍射，热重（TG）分析和粉末X射线衍射（PXRD）对化合物进行了表征。单晶X射线衍射分析表明，化合物1显示带有Schläfli点符号（4 ⁴ ·6 ²）的4联sql网络。化合物2显示带有Schläfli点符号（4 ² ·6 ⁷ ·8）（4 ² ·6）的3、5连接网络。化合物3拥有一个由Schläfli点符号（4 ² ·6）组成的3连通网。光催化研究表明，这些化合物1 - 3中的亚甲基蓝（MB）和亚甲基紫（MV）的降解，得到良好的光催化功能。此外，已经讨论了可能的光催化机理。