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- W2556492826 abstract "The crystal structures of title hydrogen-bonded co-crystals, 2C 12 H 16 O 3 ·C 12 H 10 N 2 , (I), and 2C 13 H 18 O 3 ·C 12 H 10 N 2 , (II), have been determined at 93 K. In (I), the asymmetric unit consists of one 4-( n -pentyloxy)benzoic acid molecule and one half-molecule of ( E )-1,2-bis(pyridin-4-yl)ethene, which lies about an inversion centre. The asymmetric unit of (II) comprises two crystallographically independent 4-( n -hexyloxy)benzoic acid molecules and one 1,2-bis(pyridin-4-yl)ethene molecule. In each crystal, the acid and base components are linked by O—H...N hydrogen bonds, forming a linear hydrogen-bonded 2:1 unit of the acid and the base. The 2:1 units are linked via C—H...π and π–π interactions [centroid–centroid distances of 3.661 (2) and 3.909 (2) Å for (I), and 3.546 (2)–3.725 (4) Å for (II)], forming column structures. In (II), the base molecule is orientationally disordered over two sets of sites approximately around the N...N molecular axis, with an occupancy ratio of 0.647 (4):0.353 (4), and the average structure of the 2:1 unit adopts nearly pseudo- C 2 symmetry. Both compounds show liquid-crystal behaviour." @default.
- W2556492826 created "2016-11-30" @default.
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- W2556492826 date "2016-11-08" @default.
- W2556492826 modified "2023-09-25" @default.
- W2556492826 title "Crystal structures of hydrogen-bonded co-crystals as liquid crystal precursors: 4-(n-pentyloxy)benzoic acid–(E)-1,2-bis(pyridin-4-yl)ethene (2/1) and 4-(n-hexyloxy)benzoic acid–(E)-1,2-bis(pyridin-4-yl)ethene (2/1)" @default.
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- W2556492826 doi "https://doi.org/10.1107/s2056989016017655" @default.
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