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Perchloratoborate is an anion of the form ()−. It can form partly stable solid salts with heavy alkali metals. They are more stable than nitratoborate salts. K() decomposes at 35 °C, Rb() is stable to 50 °C, and Cs() can exist up to 80 °C. Perchloratoborates are analogous to perchloratoaluminates (()−). Another related anion is the chloroperchloratoborate, Cl3B(ClO4). Boron perchlorate itself is unstable above –5 °C. ==Decomposition== On thermal decomposition the alkali perchloratoborate salts form an alkali perchlorate, and boron trioxide as a solid residue, and gas containing dichlorine heptoxide, chlorine dioxide, chlorine, and oxygen. :2M() → 2MClO4 + B2O3 + (3Cl2O7 or 6ClO2 + 4O2 or 6Cl2 + 10O2)〔 When the alkali perchloratoborates first start to decompose at the lower temperatures, the reaction is endothermic, and dichlorine heptoxide is formed. However, if caesium perchloratoborate is heated the decomposition becomes exothermic above 90 °C, and at 100 °C it explodes exothermically forming chlorine and oxygen.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Perchloratoborate」の詳細全文を読む スポンサード リンク
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