Synthesis,Crystal Structure and Thermal Properties of Zn(NH_3)_3(AFT)_2

A new coordination compound of Zn(NH_3)_3(AFT)_2(1,ZnC_6H_(13)N_(17)O_2,AFT =4-amino-3-(5-tetrazolate)-furazan)was synthesized and characterized by elemental analysis and FT-IR spectrum.Its crystal structure was determined by X-ray single-crystal diffraction.This crystal belongs to the orthorhombic system,space group Pnma with a = 18.680(3),b = 6.9438(11),c =12.268(2)A,μ= 1.592 mm-1,V= 1591.3(4)A3,M,= 420.72,Dc=1.756 g·cm-3,Z= 4,F(000)= 860,the final R = 0.0480 and wR = 0.1262 for the observed reflections with I2σ(Ⅰ).The zinc(Ⅱ)ion is five-coordinated by N atoms from two AFT"ligands and three NH3 molecules.The thermal decomposition mechanism of compound 1 was tested by differential scanning calorimetry(DSC)and thermogravimetry-derivative thermogravimetry(TG-DTG)methods.The DSC curve exhibits two endothermic and one exothermic processes.In addition,the non-isothermal kinetics parameters were calculated by using the Kissinger s method and Ozawa-Doyle's method.Besides,the entropy of activation(ΔS≠),enthalpy of activation(ΔH≠),free energy of activation(ΔG≠)and impact sensitivity(IS)was also obtained.