of RDX (219 °C) but slightly lower than that of G(ZTO)·H 2 O (252.08 °C). The constant-volume combustion heat (Δ c U ) of G 2 (ZTO), G(ZTO)·H 2 O and ZTO were determined and then the enthalpy of formation were calculated. The results show that G 2 (ZTO) possesses the highest standard molar enthalpy of formation, which may be explained by the fact that G 2 (ZTO) contains no water and possesses the highest
摘要 Bis(guanidinium) 4,4'-Azo-1 H -1,2,4-triazol-5-one [G 2 (ZTO)] 合成并通过X射线单晶衍射、元素分析仪和傅立叶变换表征红外 (FT-IR) 光谱仪。X射线单晶衍射结果表明G 2 (ZTO)在单斜空间群P 2(1)/ c 中结晶,参数为a = 4.779(2) A, b = 9.081(4) A, c = 14.676(6) A, α = 90.00°, β = 92.43(7)°, γ = 90.00°, V = 636.4(5) A 3 , Z = 2, μ (Mo K α ) = 0.131, F (000) = 328,S = 1.071,D c = 1.640 g·cm -3 ,R 1 = 0.0510 和 wR 2 = 0.1389。有趣的是,它的结构不含结晶水,这是这种材料的一个独特特征。此外,通过使用密度泛函理论
Thermal stability assessment of a new energetic Ca(II) compound with ZTO ligand by DSC and ARC
A new energetic Ca(H2O)6·(HZTO·2H2O)2 was crystallized in the monoclinic space group C2/c, and its thermal characteristics and kinetics were studied by differential scanning calorimetry (DSC) and accelerating rate calorimetry (ARC). DSC measurements showed one endothermic peak and one exothermic peak with decomposition occurring at 286.8, 290.5, 296.5, and 303.2 °C at different heating rates (2.5, 5, 10, and 20 °C min−1). The critical temperature of thermal explosion (Tb) and kinetics parameters were calculated; the results show that Ca(HZTO·2H2O)2·6H2O is stable below 273.1 °C. The thermal behavior of Ca(H2O)6·(HZTO·2H2O)2 under adiabatic condition was studied by ARC: The onset temperature was 185.7 °C, and the thermal decomposition ended at 228.2 °C within the time span of 458.1 min. In addition, thermokinetic parameters such as the activation energy Ea and pre-exponential factor A under adiabatic condition were also obtained.
3D solvent-free energetic metal–organic framework (EMOF) achieved by removing inclusion molecules from a new coordination polymer
作者:Sheng Zhang、Shuo Wu、Wendou Zhang、Qi Yang、Qing Wei、Gang Xie、Sanping Chen、Shengli Gao、Jack Y. Lu
DOI:10.1039/c8ce01803k
日期:——
The reaction of CuCl and NaN3 with 4,4′-azo-1,2,4-triazol-5-one (H2ZTO) under solvothermal conditions produced a new 3D heteronuclear Cu(i)-Na(i) energetic metal–organic framework (EMOF), [Cu3Na(ZTO)2]n·nCH3CN (1).
A novel potassium complex has been synthesized and characterized under the non-isothermal conditions by DSC and TG-DTG method. The 4,4-azo-1,2,4-triazol-5-one (ZTO) has the molecular formula C4H4N8O2. The thermodynamic parameters, HOMO-LUMO energy gap, total energy and electrostatic potential (MEP) of ZTO are conducted by density functional theory DFT/B3LYP calculation method with 6-311G basis set. In the coordination polymer, with the ligand anion (ZTO(-)) as space linkers, two types of potassium atoms centers are joined together to form three-dimensional frameworks. The enthalpy, apparent activation energy and pre-exponential factor of the second exothermic decomposition reaction are 85.43 kJ mol(-1), 414.4 kJ mol(-1) and 10(37-92) s(-1), respectively. The critical temperature of thermal explosion (T-b) for [K(ZTO)center dot H2O](infinity) is 275.08 degrees C. [K(ZTO)center dot H2O]. CCDC: 902339. (C) 2012 Elsevier B.V. All rights reserved.