Abstract
The thermal behavior of chitosanium dodecahydro-closo-dodecaborate, (C6O4H9NH3)2B12H12, was studied by thermal analysis, X-ray diffraction, and IR and X-ray photoelectron spectroscopy. As this compound is heated at a rate above 10–20 K/min, it ignites at a temperature of about 300°C. As the compound is heated to 1000°C at a rate below 10 K/min in an inert atmosphere, it yields a mixture of carbon and amorphous boron and/or boron carbides. The presence of a small amount of boron oxide in the product is explained by the formation of a partially oxidized hydroborate anion at the early stages of (C6O4H9NH3)2B12H12 decomposition via the interaction between oxygen of the chitosanium cation and the B12H 2−12 anion. Heating the initial compound in air at a rate below 10 K/min yields carbon and boron oxide as the main products. Molten boron oxide protects boron and/or boron carbides and boron nitride forming in small amounts in the particle bulk from oxidation.
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Original Russian Text © V.I. Saldin, L.N. Ignat’eva, Yu.M. Nikolenko, V.M. Buznik, Yu.M. Mikhailov, 2010, published in Zhurnal Neorganicheskoi Khimii, 2010, Vol. 55, No. 8, pp. 1296–1302.
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Saldin, V.I., Ignat’eva, L.N., Nikolenko, Y.M. et al. Thermal conversions of chitosanium dodecahydro-closo-dodecaborate. Russ. J. Inorg. Chem. 55, 1221–1227 (2010). https://doi.org/10.1134/S0036023610080115
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DOI: https://doi.org/10.1134/S0036023610080115