Three new energetic coordination polymers based on nitrogen-rich heterocyclic ligand for thermal catalysis of ammonium perchlorate

Abstract

Three new one-dimensional energetic coordination polymers (ECPs) were prepared by solvothermal method and liquid diffusion method, namely, [Mn(BODDTO)(H2O)4]n (1), [Zn(BODDTO)(H2O)4]n (2) and [Pb(BODDTO)(H2O)4]n (3) (H2BODDTO ​= ​5,5'-([3,3′-bi(1,2,4-oxadiazole)]-5,5′-diyl)bis(1H-tetrazol-1-ol)). Compounds 1 and 2 possess the same crystal structures, crystallizing in the triclinic space group P-1 with a calculated density of 1.970 ​g ​cm−3 for 1 and 2.047 ​g ​cm−3 for 2. Meanwhile, Compound 3 pertains to the P212121 space group of the orthorhombic crystal system with a density of 2.618 ​g ​cm−3. The thermal behaviors were studied by employing a Thermogravimetry instrument, the results show that the compounds have good thermal stability with the decomposition temperatures above 520 ​K. The studies of mechanical sensitivity and detonation performance reveal that these complexes are both safe and have high energy. Furthermore, the ability to catalyze the thermal decomposition of ammonium perchlorate (AP) by compounds 1–3 was studied through a differential thermal analysis instrument. The high-temperature decomposition peak temperature of AP is reduced by 94.8 ​K at most and the activation energy is also decreased. It is disclosed that three compounds can be potentially used as high-energy AP catalysts.