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Issue 43, 2016
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Cocrystals of ammonium perchlorate with a series of crown ethers: preparation, structures, and properties

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Abstract

Three cocrystals of ammonium perchlorate (AP) with a series of crown ethers have been prepared successfully through the solvent/antisolvent method, including 18-crown-6 (18C6), benzo-18-crown-6 (B18C6), and dibenzo-18-crown-6 (DB18C6). Crystal structures of the three cocrystals characterized by single crystal X-ray diffraction (SXD) reveal that all the cocrystals belong to the monoclinic system, in which the space group of the 1 : 1 cocrystal of AP/18C6 and AP/B18C6 is P21/n, P21/c for the 1 : 1.5 cocrystal of AP/DB18C6. The main intermolecular interactions in the three cocrystals are hydrogen bonds and π–π stacking. Powder X-ray diffraction (PXRD) analyses have been performed to scrutinize the purity of all the crystals. The water contact angles of the three cocrystals were measured to be 23.3° (AP/18C6), 25.4° (AP/B18C6), and 75.4° (AP/DB18C6), increasing with the number of phenyl groups connected to the crown ether, and the surface energy of the three cocrystals are greatly decreased compared to AP. The thermal properties of the cocrystals were investigated by thermogravimetry-differential scanning calorimetry (TG-DSC) and hot-stage optical microscopy (HSOM). The results indicate that the decomposition peak temperatures of the three cocrystals are greatly decreased compared to that of pure AP. In particular, the heat release increases from 475.5 J g−1 of AP to 1304.2 J g−1 for AP/B18C6 and 1488.4 J g−1 for AP/DB18C6. So, through carefully choosing the co-former of AP, cocrystallization can comprehensively tune the hygroscopicity and the thermal decomposition property of AP.

Graphical abstract: Cocrystals of ammonium perchlorate with a series of crown ethers: preparation, structures, and properties

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Publication details

The article was received on 28 Jun 2016, accepted on 05 Oct 2016 and first published on 07 Oct 2016


Article type: Paper
DOI: 10.1039/C6CE01455K
Citation: CrystEngComm, 2016,18, 8487-8496
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    Cocrystals of ammonium perchlorate with a series of crown ethers: preparation, structures, and properties

    M. Cheng, X. Liu, Q. Luo, X. Duan and C. Pei, CrystEngComm, 2016, 18, 8487
    DOI: 10.1039/C6CE01455K

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