Abstract Recent advances in the chemistry of two peculiar nitrogen-based materials, that is, ternary itinerant iron nitrides and unsubstituted guanidinate salts, are reviewed. Key to their synthesis is the versatile tool ammonia, either as a gas or as a liquid. For metallic nitrides M x Fe 4− x N including transition-metal and main-group elements M , it is of paramount importance to follow an improved ammonolytic reaction for achieving both stable and metastable compounds; in addition, there is a magnetic effect acting on the crystal structure of Ga x Fe 4− x N, and one also finds spin-glass behavior in main-group nitrides ( M = Ga, Ge, Sn). The guanidinate review features an oxidation-controlled low-temperature synthesis of Yb salts, the first magnetic guanidinates, and the doubly-deprotonated guanidinates; the latter represent the all-nitrogen analogues of the ubiquitous carbonates. The covered guanidinates adopt the compositions M CN 3 H 4 , M (CN 3 H 4 ) 2 , M (CN 3 H 4 ) 3 and M C(NH) 3 ( M = Li–Cs, Sr, Eu, Yb). We also cover the application of first-principles calculations at all levels to gain a deeper understanding of the studied materials.

中文翻译：

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流动氮化物和盐类胍盐——固态氮化学的多样性

摘要 综述了两种特殊的氮基材料，即三元流动氮化铁和未取代胍盐的化学研究进展。它们合成的关键是多功能工具氨，无论是作为气体还是作为液体。对于包括过渡金属和主族元素 M 的金属氮化物 M x Fe 4- x N，遵循改进的氨解反应以获得稳定和亚稳态化合物至关重要；此外，Ga x Fe 4− x N 的晶体结构存在磁效应，在主族氮化物（M = Ga、Ge、Sn）中也发现了自旋玻璃行为。胍盐综述的特点是 Yb 盐、第一个磁性胍盐和双去质子化胍盐的氧化控制低温合成；后者代表无处不在的碳酸盐的全氮类似物。被覆盖的胍盐采用M CN 3 H 4 、M (CN 3 H 4 ) 2 、M (CN 3 H 4 ) 3 和MC(NH) 3 (M = Li-Cs、Sr、Eu、Yb)的组成。我们还涵盖了第一性原理计算在各个级别的应用，以更深入地了解所研究的材料。