New Energetic Metal‐Organic Framework (E‐MOF) based on a sodium(I)‐containing energetic metal salt incorporating guanidinium ions

Abstract

Since there is an inherent contradiction between high-detonation properties and reliable safety (or stability) with energetic materials, E-MOFs provide an entirely new approach to balancing these properties. To explore the effects of the combination of MOFs with energetic materials and to elucidate their structure-property relationships, we report herein the development of a novel guanidiniume (CH 6 N 3 + )-containing E-MOF based on the ligand di(2'H-[1,5'-bitetrazol]-5-yl)amine (C 4 H 3 N 17 ), which was crystallized with a central sodium ion. The resulting [(CH 6 N 3] n solid featured a density of 1.625 g cm À 3 and a decomposition temperature of 221 °C.The crystal structure of the complex featured a three-dimensional layered structure with a significant number of hydrogen bonds between the layers. Moreover, the introduction of MOFs, provided a potential advantage over the dominant class of energetic materials, by boasting a multi-dimensional structure with both non-covalent interactions and covalent (coordination) bonds. As such, the introduction of shorter yet stronger coordination bonds in the E-MOF led to a higher stability of the energetic material compared to only the weak (distant) intermolecular interactions of common explosives (i. e. hydrogen bonds).

Self-Assembly Method for Synthesizing High-Dimensional EMOFs with High Stability and Laser Response

“…Along the b -axis, EMOF 1 forms clusters of 0D EMOFs. However, from the other direction (Figure c), the whole EMOF 1 form face-to-face π–π stacking structure along the two directions due to the conjugated structure of AFTO. ,− This phenomenon endows EMOF 1 with excellent stability although it is a 0D EMOF. In addition, coordinated water can form H bond networks between layers (O3–H3A···N1 (2.963 Å), O3–H3A···N4 (2.794 Å), O3–H3B···O1 (2.763 Å), and O3–H3B···N3 (3.234 Å)), thereby further enhancing the stability of EMOF 1 …”