Preparation, crystal structure and thermal decomposition of nitrogen-rich compound Cu(Trz)4Cl2 (Trz = 1,2,4-Triazole, N%   = 40.92%)

Abstract

Compared with the intriguing five-ligand coordination compound of [Cu(IMI) 4 Cl]Cl (IMI = Imidazole, 2), multi-ligand coordination compound of Cu(Trz) 4 Cl 2 (1) was synthesized by using 1,2,4-Triazole (Trz) and characterized by elemental analysis and FT-IR spectrum. The crystal structure was determined by X-ray single crystal diffraction and the crystallographic data showed that the crystal belongs to tetragonal, pertains to I4 1 /acd space group, ␣ = 14.4013(4) Å, b = 14.4013(4) Å and c = 15.7049(10) Å. Furthermore, the copper(II) cation of 1 is six-coordinated with four atoms from four Trz molecules and two Cl atoms, however, the Cu(II) ion of 2 is infrequent five-coordinated with four N atoms from four IMI ligands and a chlorine atom. Thermal decomposition mechanism was determined based on differential scanning calorimetry (DSC), and the non-isothermal kinetics parameters were calculated by the Kissinger's method, Ozawa's method and Starink's method, respectively. The energy of combustion, enthalpy of formation, critical temperature of thermal explosion, entropy of activation ( S / = ), enthalpy of activation ( H / = ), and free energy of activation ( G / = ) were also measured and calculated.