Abstract
The common feature of each of the title 2:1 cocrystals is the formation of the O–H···N(pyridyl) hydrogen bonds leading to three-molecule aggregates. The persistent formation of the O–H···N(pyridyl) hydrogen bonds where other functionalities are present, e.g. amide, indicates the robustness of this supramolecular synthon. In the structure of the 2:1 4-nitrophenylacetic acid N,N′-bis(pyridin-3-ylmethyl)oxalamide cocrystal, (1), the amide-H forms a hydrogen bond with the hydroxyl group so that rows of N,N′-bis(pyridin-3-ylmethyl)oxalamide molecules are linked into a supramolecular tape via 4-nitrophenylacetic acid molecules. In the N,N′-bis(pyridin-3-ylmethyl)thioxalamide derivative, (2), the thioamide-H atom only forms an intramolecular N–H···S contact. Nevertheless, a supramolecular tape is formed but mediated by C–H···O(nitro) interactions. Compound (1) crystallizes in the triclinic space group P¯1 with a = 8.195(2) Å, b = 9.502(3) Å, c = 9.999(3) Å, α = 90.631(3)º, β = 102.796(5)º, γ = 108.075(5)º, and Z = 1 (three molecule aggregate). Compound (2) also crystallizes in the triclinic space group P¯1 with a = 8.0772(12) Å, b = 10.2111(12) Å, c = 10.2563(17) Å, α = 71.319(10)º, β = 77.777(11)º, γ = 67.660(9)º, and Z = 1 (three molecule aggregate).
Graphical Abstract
In each cocrystal the carboxylic acid-OH interacts with the pyridyl-N atom via a hydrogen bond to result in a three-molecule aggregate. In the N,N′-bis(pyridin-3-ylmethyl)oxalamide cocrystal, these are linked into a chain via amine-H···O(carboxylic acid) interactions.
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Support from the Ministry of Higher Education, Malaysia, High-Impact Research scheme (UM.C/HIR/MOHE/SC/12) and the University of Malaya (UMRG RG125) is gratefully acknowledged.
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Arman, H.D., Kaulgud, T., Miller, T. et al. Crystal and Molecular Structures of the 2:1 Cocrystal of 4-Nitrophenylacetic acid and N,N′-bis(pyridin-3-ylmethyl)oxalamide, and with the Thioxalamide Analogue. J Chem Crystallogr 42, 673–679 (2012). https://doi.org/10.1007/s10870-012-0298-5
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DOI: https://doi.org/10.1007/s10870-012-0298-5