Search results
Results from the WOW.Com Content Network
The reaction commences with the formation of the aquo adduct, H 2 O−BF 3, which then loses HF that gives fluoroboric acid with boron trifluoride. [22] 4 BF 3 + 3 H 2 O → 3 H[BF 4] + B(OH) 3. The heavier trihalides do not undergo analogous reactions, possibly due to the lower stability of the tetrahedral ions [BCl 4] − and [BBr 4] −.
Pure H[BF 4] has not been described. The same holds true for the superacids that are known by the simplified formulas H[PF 6] and H[SbF 6]. [4] [5] However, a solution of BF 3 in HF is highly acidic, having an approximate speciation of [H 2 F] + [BF 4] − (fluoronium tetrafluoroborate) and a Hammett acidity function of −16.6 at 7 mol % BF 3, easily qualifying as a superacid. [6]
Boron trifluoride etherate, strictly boron trifluoride diethyl etherate, or boron trifluoride–ether complex, is the chemical compound with the formula BF 3 O(C 2 H 5) 2, often abbreviated BF 3 OEt 2.
Boron (III) trifluoride structure, showing "empty" boron p orbital in pi-type coordinate covalent bonds. Boron compounds are compounds containing the element boron.In the most familiar compounds, boron has the formal oxidation state +3.
General structural formula of an organotrifluoroborate anion. Organotrifluoroborates are organoboron compounds that contain an anion with the general formula [RBF 3] −.They can be thought of as protected boronic acids, or as adducts of carbanions and boron trifluoride.
HF is miscible with water (will dissolve in any proportion), while the other hydrogen halides have large solubility gaps with water. Hydrogen fluoride and water also form several compounds in the solid state, most notably a 1:1 compound that does not melt until −40 °C (−40 °F), which is 44 degrees Celsius (79 degrees Fahrenheit) above the ...
Extremely reactive cations such as those derived from Ti, Zr, Hf, and Si do in fact abstract fluoride from BF − 4, so in such cases BF − 4 is not an "innocent" anion and weakly coordinating anions (e.g., SbF 6 –, BARF –, or [Al((CF 3) 3 CO) 4] –) must be employed. Moreover, in other cases of ostensibly "cationic" complexes, the ...
LiBF 4 can also be synthesized from LiF and BF 3 in an appropriate solvent that is resistant to fluorination by BF 3 (e.g. HF, BrF 3, or liquified SO 2): [5] LiF + BF ...