Abstract Three novel Co(II) coordination polymers, formulated as {[Co(μ3-ipa)(μ-dptztz)]·DMF}n (1), {[Co(μ3-fdc)(μ-dptztz)(H2O)]·DMF}n (2) and {[Co(μ3-tdc)(μ-dptztz)]·G}n (3) (ipa: 1,3-benzenedicarboxylate, fdc: 2,5-furandicarboxylate, tdc: 2,5-thiophenedicarboxylate, dptztz: 2,5-di(4-pyridyl)thiazolo[5,4-d]thiazole, G: Guest solvent molecule) were synthesized with dptztz and V-shaped dicarboxylic acids to investigate the effects of these acids on the structural diversity. Single crystal X-ray results demonstrated that compound 1 has a 2D structure, while compounds 2 and 3 display 3D frameworks, depending on these acids. In 1 and 3, although the coordination modes of the ipa and tdc ligands are the same, different dimensions in the compounds are observed owing to the different angles between the two carboxylate arms of the linkers. Moreover, the dimensionalities of the compounds increased with the angle between two carboxylate arms. 3D networks of compound 3 are interpenetrated with each other to form a 3D + 3D → 3D interpenetrated framework with a pcu topology. Diffuse reflectance spectra showed that the optical band gaps of the compounds decreased in the presence of the dptztz ligand. Furthermore, the thermal properties of compounds 1–3 were also studied.

中文翻译：

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由2,5-二（4-吡啶基）噻唑并[5,4-d]噻唑和V形二元羧酸构成的三种Co（II）配位聚合物：合成，表征，结构多样性和光学性质

摘要三种新型的Co（II）配位聚合物，配制成{[Co（μ3-ipa）（μ-dptztz）]·DMF} n（1），{[Co（μ3-fdc）（μ-dptztz）（H2O） ]·DMF} n（2）和{[Co（μ3-tdc）（μ-dptztz）]·G} n（3）（ipa：1,3-苯二甲酸，fdc：2,5-呋喃二甲酸，tdc：2 1,5-噻吩二甲酸，dptztz：2,5-二（4-吡啶基）噻唑并[5,4-d]噻唑，G：客体溶剂分子）与dptztz和V形二元羧酸合成以研究这些酸的作用在结构上的多样性。单晶X射线结果表明，化合物1具有2D结构，而化合物2和3具有3D骨架，具体取决于这些酸。在图1和图3中，尽管ipa和tdc配体的配位方式相同，但是由于连接基的两个羧酸根臂之间的角度不同，因此化合物中的尺寸不同。而且，化合物的尺寸随两个羧酸根臂之间的夹角的增加而增加。化合物3的3D网络彼此互穿以形成具有pcu拓扑的3D + 3D→3D互穿框架。漫反射光谱表明，在dptztz配体存在下，化合物的光学带隙减小。此外，还研究了化合物1-3的热性质。