Preparation of Laser Energetic Coordination Polymers Based on Urazine by Self-Crystallization

A practical and brilliant way of preparing laser energetic coordination polymers based on crystallization chemistry and coordination theory is proposed in this paper. Design and successful synthesis of urazine (C₂H₄N₄O₂, H₂ur, 1) by the theory of "cyclization of semicarbazides" are reported. Using the "acid-controlled self-crystallization" synthesis method, with H₂ur as the ligand, we successfully synthesized [Ag(H₂ur)₂ClO₄·H₂O]_n(3) and confirmed its composition and 1D structure. In addition, 3 was subjected to a simple drying operation to obtain a solvent-free [Ag(H₂ur)₂ClO₄]_n(4). Also, 4 has the best abilities in physics and chemistry, such as excellent thermal stability, insensitivity to light, mechanical insensitivity, and good corrosion resistance. In particular, thermogravimetric analysis-differential scanning calorimetry-Fourier transform infrared spectroscopy and powder X-ray diffraction were employed to analyze the thermal decomposition products of 4 and demonstrated that the main decomposed products are AgCl, N₂, and H₂O. Moreover, the calculated predictions show that 4 has an acceptable detonation performance (P = 22.5 GPa; D = 6.9 km s^-1). Furthermore, the hot needle examination and detonation experiment show that 4 can be used as a primary explosive. More importantly, as a laser-detonated light-sensitive material, 4 has a significant application value in safety detonators (E = 100 mJ, P = 10 W, and τ = 10 ms).