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Kessler, Fabian K.; Schnick, Wolfgang (2019): Ammelinium Sulfate Monohydrate and Ammelinium Sulfate Cyanuric Acid - Synthesis and Structural Characterization. In: Zeitschrift für Anorganische und Allgemeine Chemie, Vol. 645, No. 12: pp. 848-856
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Two ionic carbon nitride type compounds containing the ammelinium cation, ammelinium sulfate cyanuric acid (6C(3)N(5)H(6)O(+)center dot 3SO(4)(2-)center dot 1(2)/3C3N3H3O3 center dot H2O) (1) and ammelinium sulfate monohydrate (2C(3)N(5)H(6)O(+)center dot SO42-center dot H2O) (2) were synthesized through hydrolysis of melam (C6N11H9) in diluted sulfuric acid. 1 crystallizes in hexagonal space group P6(3) (no. 173) with lattice parameters of a = 14.642(3), c = 13.113(4), and Z = 2. The structure is comprised of protonated ammelinium ions and neutral cyanuric acid molecules, which form a layered structure, as well as sulfate ions that span through these layers. 2 crystallizes in the triclinic space group P (1) over bar with lattice parameters of a = 7.404(3), b = 9.673(4), c = 10.040(4), a = 91.098(15), ss = 109.884(10), gamma = 92.567(13), and Z = 2. As for 1, the ammelinium rings form layers with the sulfate ions located in between. In both structures, no extended hydrogen bond networks between the respective triazine-based molecules are formed. Instead, single molecules or small building blocks occur isolated and interact primarily with sulfate anions. Compound 1, which was obtained phase pure, was further investigated by FTIR spectroscopy, solid-state NMR spectroscopy and powder X-ray diffractometry.