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Synthesis and Characterization of High-Energy Anti -Perovskite Compounds Cs 3 X [B 12 H 12 ] Based on Cesium Dodecahydro- Closo -Borate with Molecular Oxoanions ( X - = [NO 3 ] - , [ClO 3 ] - and [ClO 4 ] - ).

Rouzbeh Aghaei HakkakIoannis TiritirisThomas Schleid
Published in: Molecules (Basel, Switzerland) (2024)
Three novel anti -perovskite compounds, formulated as Cs 3 X [B 12 H 12 ] ( X - = [NO 3 ] - , [ClO 3 ] - , and [ClO 4 ] - ), were successfully synthesized through the direct mixing of aqueous solutions containing Cs 2 [B 12 H 12 ] and Cs X ( X - : [NO 3 ] - , [ClO 3 ] - , [ClO 4 ] - ), followed by isothermal evaporation. All three compounds crystallize in the orthorhombic space group Pnma , exhibiting relatively similar unit-cell parameters (e.g., Cs 3 [ClO 3 ][B 12 H 12 ]: a = 841.25(5) pm, b = 1070.31(6) pm, c = 1776.84(9) pm). The crystal structures were determined using single-crystal X-ray diffraction, revealing a distorted hexagonal anti -perovskite order for each. Thermal analysis indicated that the placing oxidizing anions X - into the 3 Cs + + [B 12 H 12 ] 2- blend leads to a reduction in the thermal stability of the resulting anti -perovskites Cs 3 X [B 12 H 12 ] as compared to pure Cs 2 [B 12 H 12 ], so thermal decomposition commences at lower temperatures, ranging from 320 to 440 °C. Remarkably, the examination of the energy release through DSC studies revealed that these compounds are capable of setting free a substantial amount of energy, up to 2000 J/g, upon their structural collapse under an inert-gas atmosphere (N 2 ). These three compounds represent pioneering members of the first ever anti -perovskite high-energy compounds based on hydro- closo -borates.
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