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• W2993667751 abstract "By employing the conjugated bithiophene ligand 5,5′-bis(1 H -imidazol-1-yl)-2,2′-bithiophene (bibp), which can exhibit trans and cis conformations, two different Cu II coordination polymers, namely, poly[[μ-5,5′-bis(1 H -imidazol-1-yl)-2,2′-bithiophene-κ 2 N : N ′](μ 2 -4,4′-oxydibenzoato-κ 2 O : O ′)copper(II)], [Cu(C 14 H 8 O 5 )(C 14 H 10 N 4 S 2 )] n or [Cu(bibp)(oba)] n , (I), and catena -poly[μ-aqua-bis[μ-5,5′-bis(1 H -imidazol-1-yl)-2,2′-bithiophene-κ 2 N : N ′]bis(μ 3 -4,4′-oxydibenzoato)-κ 3 O : O ′: O ′′;κ 4 O : O ′, O ′′: O ′-dicopper(II)], [Cu 2 (C 14 H 8 O 5 ) 2 (C 14 H 10 N 4 S 2 )(H 2 O)] n or [Cu 2 (bibp)(oba) 2 (H 2 O)] 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 {6 5 .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." @default.
• W2993667751 created "2019-12-13" @default.
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• W2993667751 date "2020-01-01" @default.
• W2993667751 modified "2023-09-23" @default.
• W2993667751 title "One-pot concomitant preparation of two copper(II) coordination polymers with different configurations of bridging bithiophene ligands" @default.
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• W2993667751 doi "https://doi.org/10.1107/s2053229619016024" @default.
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