Abstract
Four hydroxybenzoic acid building blocks, m-hydroxybenzoic acid, 2,4-dihydroxybenzoic acid, 2,5-dihydroxyterephthalic acid, and 5-hydroxyisophthalic acid, have been synthesized as robust cocrystallizing agents and employed in reactions with piperazine, including [(C4H12N 2+2 )·(C7H5O −3 )2] (1), [(C4H12N 2+2 )·(C7H5O4/−)2] (2), [(C4H12N 2+2 )·(C8H5O 2−6 )] (3), and [(C4H12N 2+2 )1/2·(C8H5O −5 )]·2H2O (4). Hydrogen-bonded directed assemblies of four salts were validated by single-crystal X-ray diffraction analysis. In compounds 1–4, hydroxybenzoic acids are all deprotonated and piperazine molecules are all protonated to form piperazine dications and keep the chair conformation. Thermal stability of these compounds has been investigated.
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Wang, L., Xue, R., Xu, L. et al. Hydrogen-bonding directed cocrystallization of flexible piperazine with hydroxybenzoic acid derivatives: Structural diversity and synthon prediction. Sci. China Chem. 55, 1228–1235 (2012). https://doi.org/10.1007/s11426-011-4487-4
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DOI: https://doi.org/10.1007/s11426-011-4487-4