An article Nonmetallic Pentazole Salts Based on Furazan or 4-Nitropyrazole for Enhancing Density and Stability WOS:000648580100014 published article about EINES KLASSISCHEN PROBLEMS; PI-STACKING; CHEMISTRY; ANION; CYCLO-N-5(-) in [Hu, Wei; Yang, Hongwei; Chen, Jieyi; Zhang, Chong; Sun, Chengguo; Hu, Bingcheng; Cheng, Guangbin] Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China in 2021.0, Cited 36.0. Quality Control of 3,5-Dimethyl-1H-pyrazole. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6
In this work, three novel nonmetallic pentazole salts (6-8) based on furazan or 4-nitropyrazole were synthesized. Some coplanar groups were introduced into the compounds to improve the planarity of the crystal packing. 4-Amino-1,2,5-oxadiazole-3-carbohydrazonamide pentazolate (6), 5-(4-amino-1,2,5-oxadiazol-3-yl)-4H-1,2,4-triazole-3,4-diamine pentazolate (7), and 5,5′-(4-nitro-1H-pyrazole-3,5- diyl)-bis(4H-1,2,4-triazole-3,4-diamine) pentazolate (8) all show more stable pi-pi stacking and exhibit superior thermal stability (110.5-116.4 degrees C) than most other reported nonmetallic pentazole salts (T-onset: 80-110 degrees C), and compound 8 has the highest crystal density (1.722 g.cm(-3)/173 K) of nonmetallic pentazole salts to date. All salts have been thoroughly characterized by NMR (H-1 and C-13) spectroscopy, infrared (IR), Roman (RA), and elemental analysis. The decomposition temperature of all salts displays more than 110 degrees C, which is measured by differential scanning calorimetry (DSC). These compounds all shows low sensitivity (IS > 35 J, FS > 360 N) measured by standard BAM methods. Glycidyl azide polymer (GAP) based propellant formula with the addition of salt 6 or 7 shows a higher specific impulse (6, I-sp = 262.1 s; 7, I-sp = 263.9 s) than that of RDX (I-sp = 259.0 s). This study can provide a new crystal engineering way for the synthesis of pentazole salt to solve the problem of low density and poor stability.
Quality Control of 3,5-Dimethyl-1H-pyrazole. About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Hu, W; Yang, HW; Chen, JY; Zhang, C; Sun, CG; Hu, BC; Cheng, GB or concate me.
Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics