Preparation, Crystal Structure, and Thermal Analysis of Carbohydrazide Trinitrophloroglucinolate

A new Compound (CHZ)(HTNPG)center dot 0.5H(2)O was synthesized by mixing carbohydrazide(CHZ) and trinitrophloroglucinol(TNPG) and characterized by elemental analysis and Fourier transform infrared (FTIR) spectrum. Its crystal structure was determined by single crystal X-ray diffraction analysis. The crystal belongs to triclinic system, P (1) over bar space group, with a=0.45578(9) nm, b=1.0142(2) nm, c=1.3041(3) nm, alpha=86.53(3)degrees, beta=99.56(3)degrees, gamma=81.94(3)degrees. V=3 0.5958(2) nm(3). Z=2. D-c=2.008 g/cm(3) R-1=0.0476, and wR(2)=0.1139. The compound is a di-substituted salt of TNPG. which consists of a cation (CHZ)(2+) and an anion (HTNPG)(2-). The thermal analysis of the compound was studied by means of differential scanning calorimetry(DSC) and thermogravimetry-derivative thermogravimetry(TG-DTG). Under nitrogen atmosphere at a heating rate of 10 degrees C/min, the thermal decomposition of the compound contained one endothermic process of dehydrating stage and two intense exothermic decomposition processes in a temperature range of 140-232 degrees C on the DSC trace. The decomposition products of the title compound arc nearly gaseous products. The existing complicated hydrogen bond networks and electrostatic attraction between (CH Z)(2+) and (HTNPG)(2-) enhance the thermal stability of the title Compound.