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|Section2= |Section3= |Section4= }} Fluoroboric acid or tetrafluoroboric acid is an inorganic compound with the chemical formula . It is mainly produced as a precursor to other fluoroborate salts.〔Gregory K. Friestad, Bruce P. Branchaud "Tetrafluoroboric Acid" E-Eros Encyclopedia of Reagents for Organic Synthesis. 〕 It is a strong acid. Fluoroboric acid is corrosive and attacks the skin. It is available commercially as a solution in water and other solvents such as diethyl ether. With a strength comparable to nitric acid, fluoroboric acid is a strong acid with a weakly coordinating, non-oxidizing conjugate base. It is structurally similar to perchloric acid, but lacks the hazards associated with oxidants. ==Structure and production == Although the solvent-free HBF4 has not been isolated, its solvates are well characterized. These salts consist of protonated solvent as a cation, e.g., H3O+ and H5O2+, and the tetrahedral BF4− anion. The anion and cations are strongly hydrogen-bonded.〔Mootz, D.; Steffen, M. "Crystal structures of acid hydrates and oxonium salts. XX. Oxonium tetrafluoroborates H3OBF4, ()BF4, and ()BF4", ''Zeitschrift für Anorganische und Allgemeine Chemie 1981, vol. 482, pp. 193-200''. 〕 Aqueous solutions of HBF4 are produced by dissolving boric acid in aqueous hydrofluoric acid. Three equivalents of HF react to give the intermediate boron trifluoride and the fourth gives fluoroboric acid: :: B(OH)3 + 4 HF → H3O+ + BF4− + 2 H2O Anhydrous solutions can be prepared by treatment of aqueous fluoroboric acid with acetic anhydride.〔Wudl, F.; Kaplan, M. L., "2,2′-Bi-L,3-Dithiolylidene (Tetrathiafulvalene, TTF) and its Radical Cation Salts" Inorg. Synth. 1979, vol. 19, 27. 〕 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「Fluoroboric acid」の詳細全文を読む スポンサード リンク
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