Studies on sodium polymers based on di(1H-tetrazol-5-yl)methanone oxime

Abstract

[Na(Hbto)(H₂O)₂·2H₂O]_n (1), [(NH₃OH)₂Na₂(bto)₂(H₂O)₄·H₂O]_n (2) and [(NH₃OH)Na(bto)(H₂O)₂]_n (3), eco-friendly coordination polymers, have been synthesized. The structures have been confirmed by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. The crystal results demonstrate that compound 1 exhibits an infinite 2-dimensional (2D) network metal–organic framework (MOF), whereas compounds 2 and 3 feature infinite 1-dimensional (1D) Na-polymer chain structures. Additionally, the DSC tests display that the dehydrated polymers possess excellent thermal stability, and their thermal decomposition temperatures are as high as 250 °C. The enthalpies of formation are calculated based on the experimental constant-volume energies of combustion. Non-isothermal kinetic and thermodynamic parameters are investigated through Kissinger's method as well as Ozawa's method. Furthermore, the yellow flame color of the prepared compounds are confirmed. The sensitivities toward impact (>40 J) and friction (>360 N) are investigated via standard methods.