Abstract
1-Methylpiperazine was employed to crystallize with 2,4-dihydroxybenzoic acid and 1,8-naphthalene acid, affording two multi-component hydrogen-bonding salts [(C5H14N2)2+·(C7H5O4)2 −·H2O](1) and [(C5H14N2)2+(C12H6O4)2−·2H2O](2). These two forms of salts are both monoclinic systems with space group P21/c(14). The lattice parameters of salts 1 and 2 are a=1.32666(10) nm, b=0.90527(7) nm, c=1.67107(13) nm, β=103.125(1)° and a=1.4950(2) nm, b=0.75242(15) nm, c=1.6563(3) nm, β=92.834(2)°, respectively. Expected classical hydrogen bonds N-H⋯O and O-H⋯O appear in the chargetransfer salts, and asymmetric units of these two forms both contain water molecules which play a significant role in building novel supramolecular architectures. Robust hydrogen-bond interactions between 1-methylpiperazine and aromatic acid provide sufficient driving force to direct the two crystals to three-dimensional structures. Weak interactions C-H⋯O emerging in salts 1 and 2 further enhance their crystal structures. As a consequence, hydrogen-bonding interactions in these compounds afford diverse 3D net supramolecular architectures. Thermal stability of these compounds was investigated by thermogravimetric analysis(TGA).
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Supported by the National Natural Science Foundation of China(Nos.51372125, 21203106), the Fund of the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, China(No.2013-34), and the Scientific and Technical Development Project of Qingdao City, China(No.13-1-4-184-jch).
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Yang, Y., Xu, W., Hu, Y. et al. Multi-component hydrogen-bonding organic salts formed from 1-methylpiperazine with aromatic carboxylic acids: Synthons cooperation and crystal structures. Chem. Res. Chin. Univ. 31, 9–15 (2015). https://doi.org/10.1007/s40242-015-4304-2
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DOI: https://doi.org/10.1007/s40242-015-4304-2