Abstract Methylammonium dicyanamide, (CH3NH3)[N(CN)2], was synthesized by metathesis from methylammonium chloride and silver dicyanamide, Ag [N(CN)2], in dry diethyl ether. The crystal structure was solved from single-crystal X-ray data at T = −173 °C (Pma2, a = 8.9541 (11) A, b = 7.5136 (9) A, c = 3.9631 (5) A; V = 266.63 (6) A3; Z = 2). The title compound was further analysed by means of NMR and Raman spectroscopies as well as DSC and DTA. Methylammonium dicyanamide, a waxy solid at RT, may be classified as an ionic liquid at T > 63 °C. At lower temperatures, methylammonium dicyanamide exhibits a robust network of hydrogen bonds, stabilizing and fixing the molecular cations as well as anions in the crystal lattice. Above T ~43 °C, indications for an onset of dynamic disorder are discernible. Finally, beyond T = 170 °C, the initially salt-like compound decomposes by releasing stable and volatile molecules (e.g. H2NCN, HCN, NH3). The title compound, C3N4H6, displaying a C/N ratio of ¾, is a potential single source precursor for the synthesis of C3N4, and fulfils the commonly accepted criteria to be addressed as an “ionic liquid”.

中文翻译：

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图 TOC，二氰胺甲基铵：合成、表征和筛选其作为 C3N4 前体和离子液体的潜力

摘要 甲基二氰胺(CH3NH3)[N(CN)2]是由甲基氯化铵和二氰胺银Ag[N(CN)2]在无水乙醚中复分解合成的。晶体结构由 T = -173 °C 时的单晶 X 射线数据求解（Pma2, a = 8.9541 (11) A, b = 7.5136 (9) A, c = 3.9631 (5) A; V = 266.63 (6) A3；Z = 2)。通过NMR和拉曼光谱以及DSC和DTA进一步分析标题化合物。二氰胺甲基铵在室温下为蜡状固体，在 T > 63 °C 时可归类为离子液体。在较低温度下，二氰胺甲基铵表现出强大的氢键网络，稳定和固定分子阳离子以及晶格中的阴离子。高于 T ~43 °C，动态障碍发作的迹象是可辨别的。最后，超过 T = 170 °C，最初的盐状化合物通过释放稳定且易挥发的分子（例如 H2NCN、HCN、NH3）而分解。标题化合物 C3N4H6 的 C/N 比为 3/4，是合成 C3N4 的潜在单一来源前体，符合公认的“离子液体”标准。