13826-83-0Relevant articles and documents
Production and decomposition of (NH4)[BF4] and H3N-BF3
Gbbels, Dirk,Meyer, Gerd
, p. 1799 - 1805 (2002)
(NH4)[BF4] is produced as single crystals during the reaction of elemental boron and NH4HF2 (B:NH4HF2 = 1:2) and NH4F (B:NH4F = 1:4), respectively, in sealed copper ampoules at 300°C. The crystal structure (baryte type, orthorhombic, Pnma, Z = 4) was redetermined at ambient temperature (a = 909.73(18), b = 569.77(10), c = 729.47(11) pm, Rall = 0.0361) and at 140 K (a = 887.3(2), b = 574.59(12), c = 717.10(12)pm, Rall = 0.0321). Isolated (NH4)+ and [BF4]- tetrahedra are the important building units. The thermal behaviour of (NH4)[BF4] was investigated under inert (Ar, N2) and reactive conditions (NH3) with the aid of DTA/TG and DSC measurements and with in-situ X-ray powder diffraction as well. Finally, (NH4)[BF4] is decomposed yielding NH3 and BF3, BN is not produced under the current conditions. Colourless single crystals of H3N-BF3 were prepared directly from the components NH3 and BF3. The crystal structure was determined anew at 293 and 170 K (orthorhombic, Pbca, Z = 8, a = 815.12(10), b = 805.91(14), c = 929.03(12) pm, Rall = 0.0367; a = 807.26(13), b = 800.48(10), c = 924.31(11)pm, Rall = 0.0292, T = 170 K). The crystal structure contains isolated molecules H3N-BF3 in staggered conformation with a B-N distance of 158 pm. The thermal behaviour of H3N-BF3 was studied likewise.
Interaction of datolite concentrate with ammonium hydrodifluoride
Krysenko,Medkov,Epov
, p. 1163 - 1165 (2010)
The interaction of datolite concentrate with ammonium hydrodifluoride were studied. Under heating, ammonium hydrodifluoride fluorinates datolite to form complex fluoroammonium salts of boron, silicon, and impurity metals. The activation energy and rate constants were calculated for the reaction of datolite concentrate with ammonium hydrodifluoride in the range 100-150°C. The composition of the vola-tiles formed upon the heating of the fluorinated concentrate was studied, the temperature parameters of the evolution of boron and silicon to the gas phase were determined, and a process for separating these elements was proposed. Pleiades Publishing, Ltd., 2010.
Stolba, F.
, p. 95 (1870)
Reaction of arenediazonium tetrafluroborates with N,N-methylenediacryalmide in the presence of thiocyanate anions
Grishchuk,Baranovskii,Gorbovoi,Ganushchak
, p. 957 - 960 (2007/10/03)
The reactions of arenediazonium tetrafluoroborates with N,N-methylenediacrylamide in H2O-DMF (1:3) and H2O-DMSO (1:4) in the presence of thiocyanate anions involve thiocyanatoarylation by one or two multiple bonds to give [(3-aryl-2-