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Preparation and Structural Assessment of Cocrystal Solvates and Cocrystal Salts of 1,3,5-Triazine-2,4,6-triamine with alpha-Hydroxycarboxylic Acids
* 1 , 1 , 2 , 2 , 3 , 2
1  Department of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
2  Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain.
3  Department of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.

Abstract:

In the present research, three cocrystals containing 1,3,5-triazine-2,4,6-triamine (melamine, me) were synthesized and characterized. The robustness of the amine-acid supramolecular synthon is discussed in the stoichiometry of the cocrystals of (me)·(H2ga)·1/2H2O (I), (me)·(Hme+)·(Hma-)·DMSO·3H2O (II) and (Hme+)·(Hma-)·diox·2H2O (III). The abbreviated designations used are glycolic acid (H2ga), mandelic acid (H2ma), dimethyl formamide (DMF), dimethyl sulfoxide (DMSO) and 1,4-Dioxane (diox). All the crystalline materials have been characterized by 1H-NMR, 13C-NMR, IR, and X-ray diffraction. The supramolecular assembly of each cocrystal is also analyzed and discussed.

Keywords: Co-crystallisation; melamine; hydroxycarboxylic acids; crystal engineering; supramolecular architectures; hydrogen bond
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