A novel energetic compound 3-(3,5-dimethylpyrazol-1-yl)-6-semicarbazide-1,2,4,5-tetrazine(DSTZ) was prepared and characterized by elemental analysis and Fourier transform infrared(FTIR) spectroscopy.The crystal structure was determined by X-ray single crystal diffraction technology.The crystal belongs to the monoclinic system with a P2 1 /c space group,a=0.9942(7) nm,b=0.5067(3) nm,c=1.1830(8) nm,β=109.616°,Z=2 and D c =1.475 g/cm 3.With extensive hydrogen bonds,the molecules were linked together to form a three-dimensional herringbone-like pattern.Thermal analysis of the compound was carried out via differential scanning calorimetry(DSC) and thermogravimetric-derivative thermogravimetry(TG-DTG).Under a nitrogen atmosphere at a heating rate of 10 K/min,DSTZ decomposed directly in a range of 493―513 K.Only one intense exothermic process was observed and the decomposition products were all gaseous products.Conventional sensitivity properties were determined,showing that the title complex was insensitive to friction,impact and flame.
The coordination compound of [Sr(CHZ)(TNR)(H2O)(OH)]2·2H2O (TNR: 2,4,6-trinitroesorcinol, CHZ: carbohydrazide) was prepared by reacting CHZ solution and strontium styphnate solution (obtained through the reaction of strontium carbonate and styphnic acid). The molecular structure was characterized by using X-ray diffraction analysis, element analysis and FTIR analysis. The crystal belongs to triclinic with space group P1. The unit cell parameters were as follows: a=0.725 2(2) nm, b=1.021 2(2) nm, c=1.144 0(2) nm, α=69.50(3)°, β=78.82(3)°, γ=84.64(3)° and Z=2. The thermal decomposition of the compound is studied using differential scanning calorimetry (DSC) and thermogravimetry thermogravimetry-derivative (TG-DTG) techniques. CCDC: 269310.
A dinuclear complex Cd2(dnba)4(pyridine)4 (dnba = 3,5-dinitrobenzoate) has been synthesized by hydrothermal method and characterized by X-ray single-crystal diffraction, elemen- tal analysis, FT-IR spectroscopy, DSC and TG-DTG techniques. The complex with empirical formula C48H32Cd2N12O24 (Mr = 692.83) crystallizes in monoclinic, space group P21/n with a = 12.0344(14), b = 10.5752(13), c = 21.578(3) ’, β = 104.150(2)o, V = 2662.8(6) ’3, Z = 2, Dc = 1.728 g/cm3, μ(MoKα) = 0.897 mm-1, F(000) = 1384, S = 1.016 and (’/σ)max = 0.001. R = 0.0638 and wR = 0.0737 for all data; the final R = 0.0337 and wR = 0.0644. In this complex, four carboxylates are bidentate- or chelate-coordinated with the Cd(II) centers to give the dinuclear structure. The other coordination positions of Cd(II) are occupied by the lone pair electrons from N of four pyridines. Thermal analyses DSC and TG-DTG have been used to determine the thermal decomposition mechanism of the title complex.
GUO Jin-Yu ZHANG Tong-Lai ZHANG Jian-Guo LIU Yan-Hong QIAO Xiao-Jing YANG Li
