Synthesis, structure and characterization of 1-D polymer {[Sr(CHZ)2(ClO4)]ClO4}n: a new concept for designing primary explosives

Abstract

A novel alkaline-earth metal perchlorate polymer complex {[Sr(CHZ)₂(ClO₄)]ClO₄}_n (1, CHZ = carbohydrazide) was synthesized and characterized. The X-ray single crystal diffraction results illustrate that the structure of the title complex belongs to the triclinic system, space group P. In 1, every Sr²⁺ ion was ennea-coordinated with four CHZ groups and one perchlorate group. Noticeably, CHZ adopted a tridentate coordination mode with different Sr²⁺ ions, leading to a multinuclear structure. Therefore, the whole molecule was extended to a super 1-D polymer, and the configuration of Sr²⁺ ion was a tricapped trigonal prism of a tetradecahedron. The DSC result shows only one exothermal decomposition with peak temperature at 296.1 °C. The TG–DTG curve demonstrates a 67.8% mass loss from 266 °C to 332 °C. Non-isothermal kinetic and thermodynamic parameters were obtained via Kissinger's method as well as Ozawa's method. The critical temperature of thermal explosion, ΔS, ΔH, and ΔG were calculated as 248.1 °C, 35.61 J K⁻¹ mol⁻¹, 161.15 kJ mol⁻¹, 152.42 kJ mol⁻¹, respectively. Additionally, the sensitivities towards impact and friction were assessed via relevant standard methods.