Four novel Co(II) metal–organic frameworks, namely [Co₂(4,4′-cpmb)₂(1,1′-bbi)₂]_n (1), [Co(4,4′-cpmb)(4,4′-bbibp)]_n (2), {[Co(4,4′-cpmb)(tib)]·3(H₂O)}_n (3) and {[Co(4,4′-sdc)(tib)]·(H₂O)}_n (4) (flexible 4,4′-cpmb = 4-(4-carboxylphenylmethylthio)benzoic acid, rigid 4,4′-sdc = 4,4′-stilbenedicarboxylic acid, flexible 1,1′-bbi = 1,1′-(1,4-butanediyl)bis(imidazole), rigid 4,4′-bbibp = 4,4′-bis(benzoimidazo-1-ly)biphenyl and rigid tib = 1,3,5-tris(1-imidazolyl)benzene) were synthesized employing a rational design approach under solvothermal conditions and further characterized by elemental analysis, IR spectra, thermogravimetric (TG) analysis, powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. The four Co-MOFs display different interpenetrated structures due to the flexibility of O/N-donor ligands. Single-crystal X-ray diffraction analysis reveals that complex 1 displays a 6-fold interpenetrating class Ia net with the point Schläfli symbol of (6⁶). Complex 2 shows a 3-fold interpenetrating sqc5 net with the point Schläfli symbol of (6⁶·8). Complexes 3 and 4 exhibit a 2-fold interpenetrating 4-connected sql topology with the point Schläfli symbol of (4⁴·6²). The photodegradation properties and dye adsorption capacity of complexes 1–4 are investigated, and the framework integrity of complexes 1–4 can be well-retained.

中文翻译：

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通过混合配体策略 合理组装功能性Co-MOF ：合成，结构，拓扑变化，光降解特性和染料吸附†

四个新颖的​​Co（II）金属-有机骨架，即[Co ₂（4,4'-cpmb）₂（1,1'-bbi）₂ ] _n（1），[Co（4,4'-cpmb）（ 4,4'-bbibp）] _n（2），{[Co（4,4'-cpmb）（tib）]·3（H ₂ O）} _n（3）和{[Co（4,4'- sdc）（tib）]·（H ₂ O）} _n（4）（柔性4,4'-cpmb = 4-（4-羧基苯基甲硫基）苯甲酸，刚性4,4'-sdc = 4,4'-苯乙烯二羧酸，柔性1,1'-bbi = 1,1'-（ 1,4-丁二基）双（咪唑），刚性4,4'-bbibp = 4,4'-双（苯并咪唑-1-基）联苯，刚性tib = 1,3,5-三（1-咪唑基）苯）是在溶剂热条件下采用合理设计方法合成的，并通过元素分析，红外光谱，热重（TG）分析，粉末X射线衍射（PXRD）和单晶X射线衍射进一步表征。由于O / N供体配体的灵活性，这四个Co-MOF表现出不同的互穿结构。单晶X射线衍射分析表明，配合物1显示出6倍互穿的Ia级网，其Schläfli点符号为（6⁶）。复数2显示3倍互穿的sqc5网络，其点Schläfli符号为（6 ⁶ ·8）。配合物3和4表现出2倍互穿的4连接sql拓扑，点Schläfli符号为（4 ⁴ ·6 ²）。研究了配合物1-4的光降解特性和染料吸附能力，并且可以很好地保留配合物1-4的骨架完整性。