Synthesis, crystal structure of 2,4-dihydroxybenzoic acid lead and its catalytic decomposition effect on AP and RDX

2,4-Dihydroxybenzoic acid lead (beta-Pb) was synthesized and its single crystal structure was reported firstly. beta-Pb crystallizes in monoclinic system with space group of C2/m and crystal parameters of a=17.888(3) & Aring;, b=4.8790(8) & Aring;, c=21.408(4) & Aring;, beta=100.258(5) degrees, Z=2, V=1838.5(5) & Aring;(3), mu=12.213 mm(-1), F(000) = 1000.0 and D-calc = 1.920 g/cm(3). 2,4-Dihydroxybenzoic acid presents a monoacid form only, two different coordination forms of Pb2+ exist in crystal structure of beta-Pb, and the two phenolic hydroxyl groups all do not involved in coordination with lead ions. The thermal decomposition of beta-Pb and its catalytic effect on thermal decomposition of AP and RDX were explored. For AP, the low-temperature decomposition temperature (LTT) and high-temperature decomposition temperature (HTT) decrease by 30.4 degrees C and 31.3 degrees C with the addition of beta-Pb, and their apparent activation energies (E-a) decrease by 44.4 kJ/mol and 31.6 kJ/mol, respectively. For RDX, the thermal decomposition temperature and E-a decrease by 11 degrees C and 110.7 kJ/mol respectively, after the addition of beta-Pb. beta-Pb shows excellent catalytic decomposition effect on AP and RDX.