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|Section2= |Section3= |Section7= |Section8= }} Perrhenic acid is the chemical compound with the formula Re2O7 (OH2)2. It is obtained by evaporating aqueous solutions of Re2O7. Conventionally, perrhenic acid is considered to have the formula HReO4, and a species of this formula forms when rhenium(VII) oxide sublimes in the presence of water or steam.〔.〕 When a solution of Re2O7 is kept for a period of months, it breaks down and crystals of HReO4.H2O are formed, which contain tetrahedral ReO4 ==Properties== The structure of solid perrhenic acid is ().〔Beyer, H.; Glemser, O.; Krebs, B. “Dirhenium Dihydratoheptoxide Re2O7(OH2)2 - New Type of Water Bonding in an Aquoxide” Angewandte Chemie, International Edition English 1968, Volume 7, Pages 295 - 296. .〕 This species is a rare example of a metal oxide coordinated to water - most often metal-oxo-aquo species are unstable with respect to the corresponding hydroxides: : M(O)(H2O) → M(OH)2 Gaseous perrhenic acid is tetrahedral, as suggested by its formula HReO4. 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「perrhenic acid」の詳細全文を読む スポンサード リンク
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