By employing the conjugated bithiophene ligand 5,5'-bis(1H-imidazol-1-yl)-2,2'-bithiophene (bibp), which can exhibit trans and cis conformations, two different CuII coordination polymers, namely, poly[[μ-5,5'-bis(1H-imidazol-1-yl)-2,2'-bithiophene-κ2N:N'](μ2-4,4'-oxydibenzoato-κ2O:O')copper(II)], [Cu(C14H8O5)(C14H10N4S2)]n or [Cu(bibp)(oba)]n, (I), and catena-poly[μ-aqua-bis[μ-5,5'-bis(1H-imidazol-1-yl)-2,2'-bithiophene-κ2N:N']bis(μ3-4,4'-oxydibenzoato)-κ3O:O':O'';κ4O:O',O'':O'-dicopper(II)], [Cu2(C14H8O5)2(C14H10N4S2)(H2O)]n or [Cu2(bibp)(oba)2(H2O)]n, (II), have been prepared through one-pot concomitant crystallization and characterized by single-crystal X-ray diffraction, IR spectroscopy, elemental analysis, powder X-ray diffraction (PXRD) and thermogravimetric (TG) analysis. Single-crystal X-ray diffraction indicates that the most interesting aspect of the structure is the existence of sole trans and cis conformations of the bibp ligand in a single net of (I) and (II), respectively. Compound (I) displays a threefold interpenetrating three-dimensional framework with a 4-connected {65.8} cds topology, whereas (II) features a one-dimensional chain structure. In the crystal of (II), the polymeric chains are further extended through C-H...O hydrogen bonds and C-H...π interactions into a three-dimensional supramolecular architecture. In addition, strong intramolecular O-H...O hydrogen bonds formed between the bridging water molecules and the carboxylate O atoms improve the stability of the framework of (II). Furthermore, solid-state UV-Vis spectroscopy experiments show that compounds (I) and (II) exhibit optical band gaps which are characteristic for optical semiconductors, with values of 2.70 and 2.26 eV, respectively.

中文翻译：

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一锅同时制备具有不同构型的联噻吩配体的两种铜（II）配位聚合物。

粉末X射线衍射（PXRD）和热重分析（TG）分析。单晶X射线衍射表明，该结构最有趣的方面是在（I）和（II）的单个网中分别存在bibp配体的唯一反式和顺式构象。化合物（I）显示具有四联{65.8} cds拓扑结构的三重互穿三维框架，而化合物（II）具有一维链结构。在（II）的晶体中，聚合物链进一步通过CH ... O氢键和CH ...π相互作用延伸成三维超分子结构。另外，在桥连的水分子和羧酸的O原子之间形成的强分子内OH ... O氢键改善了（II）的骨架的稳定性。此外，