Synthesis,Crystal Structure,Thermal Decomposition and Sensitive Properties of a New Complex [Cu(IMI)4](PA)2

A new coordination complex [Cu(IMI)4](PA)2 had been synthesized with imidazole(IMI) as ligands and picrate(PA-) groups as outer anions,and characterized by Fourier transform infrared(FTIR) spectrum and elemental analysis.Its crystal structure was determined by single crystal X-ray diffraction(XRD) analysis.The crystallographic data show that the crystal belongs to monoclinic,C2/c space group,a=2.542(5) nm,b=0.91773(18) nm,c=1.3778(3) nm,β=107.854(3)° and Z=4.Furthermore,the central copper(II) ion is coordinated by four N atoms from four imidazole ligands.All the molecular units are linked into a zigzag pattern along a-axis by the hydrogen bonds,and extended to the distance regularly.Thermal decomposition mechanisms were determined based on differential scanning calorimetry(DSC) and thermogravimetry-differential thermogravimetry(TG-DTG) analysis,and kinetic parameters of the first exothermic process were studied using Kissinger’s and Ozawa-Doyle’s method,respectively.Sensitivity tests show that the title complex has low sensitivity to external stimulus,but it has a higher energy of combustion of 14.2 kJ/g due to which it may be used as the additives of energetic materials to improve the explosive performance.