Two recently introduced concepts in the design of high-energy-density materials (HEDMs), namely Metal-organic frameworks (MOFs) and Chelating energetic material (CEM), have been applied in the synthesis of the energetic manganese (II) compound {[Mn(btm)(H2O)(3)](2)center dot H2O}(n) (1) (H(2)btm = bis(tetrazole)methane), cocrystalized by a dinuclear CEM and a 1D MOF, which is characterized by elemental analysis and FTIR spectroscopy. Single-crystal X-ray diffraction analysis revealed that 1 crystallizes in the monoclinic space group P-21/c. The Mn2+ was hexa-coordinated with two btm groups and three water molecules. Btm presents tridentate coordination modes. The thermal decomposition mechanism of 1 was studied by differential scanning calorimetry (DSC). The non-isothermal kinetics parameters were calculated by the Kissinger's method and Ozawa-Doyle's method, respectively. Sensitivity tests revealed that 1 is insensitive to mechanical stimuli.