Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 344-04-7, Name is 1-Bromo-2,3,4,5,6-pentafluorobenzene, molecular formula is C6BrF5, belongs to bromides-buliding-blocks compound. In a document, author is Funk, Christian, introduce the new discover, Safety of 1-Bromo-2,3,4,5,6-pentafluorobenzene.
A new class of mixed-valent europium halide ortho-oxoborates: Eu6X [BO3](4) (X = Cl and Br)
Attempts to obtain Eu5Br[BO3](3) by the reaction of europium sesquioxide (Eu2O3) and elemental boron (B) at 1323 K in the presence of sodium bromide (NaBr) acting as flux and bromine source for 72 h in a silica-jacketed niobium capsule yielded single crystals of Eu-3[BO3](2) and the hitherto unknown bromide oxoborate Eu6Br[BO3](4) by serendipity. Optimizing the starting reactant ratios and variations of the fluxes gave access to isotypic Eu6X[BO3](4) representatives with X = Cl and Br. Their hexagonal crystal structures was determined by single-crystal X-ray diffraction and adopt the non-centrosymmetric space group P6(3)mc with lattice parameters in the range of a = 1052-1061 pm and c = 681-685 pm at 298 K as well as a = 1050-1059 pm and c = 680-682 pm at 100 K for Z = 2. Eight- and nine-fold coordinated europium cations have planar [BO3](3-) triangles and one of these also two halide anions as neighbors. The Raman and IR spectra of both compounds were acquired and compared to literature data to confirm the presence of isolated [BO3](3-) anions. Additionally, Mo beta bauer spectra and magnetic susceptibility measurements confirmed the simultaneous presence of di- and trivalent europium cations according to (Eu2+)(5)(Eu3+)(X-)([BO3](3-))(4) with X = Cl and Br. (C) 2020 Elsevier B.V. All rights reserved.
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