C:Corrosive;7699-45-8Relevant articles and documents
Synthesis, crystal structures and thermal properties of new ZnBr 2(pyrimidine) coordination compounds
Naether, Christian,Bhosekar, Gaurav,Jess, Inke
, p. 5353 - 5359 (2007)
Four new bromidozinc(II) coordination compounds with pyrimidine as a ligand were prepared, either in solution or by thermal decomposition reactions, and the thermal reactivity and thermodynamic stability of these compounds were investigated. These results are compared with those for the corresponding ZnI2(pyrimidine) compounds. The ligand-rich 1:2 compound dibromidobis(pyrimidine-N)zinc(II) (I) crystallizes in the monoclinic space group P21/n. In this structure the zinc atoms are coordinated by two bromido ligands and two pyrimidine ligands within distorted tetrahedra. On heating, compound I is transformed into the ligand-deficient 2:3 intermediate bis(dibromido)bis(pyrimidine-N)(μ2-pyrimidine-N,N′) dizinc(II) (II), which crystallizes in the monoclinic space group C2/c. The crystal structure consists of two ZnBr2(pyrimidine) subunits, which are connected by an additional pyrimidine ligand through μ-N,N′ coordination. Thermal decomposition of compound II leads to the formation of the ligand-deficient 1:1 compound dibromido(μ2-pyrimidine-N,N′) zinc(II) (III), which crystallizes in the orthorhombic space group Pmma. In compound III, the zinc atoms are coordinated by four bromine atoms and two pyrimidine ligands within distorted octahedra. The ZnBr2 units are connected through common edges into chains, which are linked by the pyrimidine ligands into layers. On heating, compound III is transformed into the ligand-deficient 2:1 compound (ZnBr2)2-(pyrimidine) (IV), which decomposes to give ZnBr2. Solvent-mediated conversion experiments in solution show that not all of the compounds can be prepared by treating ZnBr2 and pyrimidine in the molar ratio given by the formula of the final product. Wiley-VCH Verlag GmbH & Co. KGaA, 2007.
TG and TG-MS methods for studies of the reaction between metal oxide and brominated flame retardant in various atmospheres
Oleszek, Sylwia,Grabda, Mariusz,Shibata, Etsuro,Nakamura, Takashi
, p. 13 - 21 (2012)
TG and TG-MS measurements were used to investigate the reactivity of ZnO with HBr originating from thermal degradation of TBBPA and with SbBr3 under various atmospheres. It was found, that the HBr is an excellent brominating agent for ZnO and separates zinc as a volatile bromide (50 and 70% in He and He + 5 vol% O2, respectively) from the solid residue. In inert atmosphere the formed char plays an important role as reduction agent for remaining ZnO into metallic Zn, which vaporizes completely from the residue above 890 °C. In presence of oxygen, the char is oxidized into CO and CO2 and un-reacted ZnO remains. Bromination efficiency from thermal treatment of SbBr3 + ZnO in He is about 14% only. Such low efficiency may results from highly volatile SbBr3 sublimating from the mixture above 100 °C and its high ability to form thermally stable oxybromide compound (Sb8O11Br2). Simultaneous TG-MS measurements indicate that the presence of ZnO strongly influences the TBBPA degradation pathway and causes enhancement of char formation. Catalyzing effect of ZnO on evaporation of SbBr3 was also observed.
Revealing the structural chemistry of the group 12 halide coordination compounds with 2,2′-bipyridine and 1,10-phenanthroline
Swiatkowski, Marcin,Kruszynski, Rafal
, p. 642 - 675 (2017/02/05)
The coordination compounds of group 12 halides with 2,2′-bipyridine (bpy) and 1,10-phenanthroline (phen), 2[CdF2(bpy)2]·7H2O (1), [ZnI(bpy)2]+·I3 ? (2), [CdI2(bpy)2] (3), [Cd(SiF6)H2O(phen)2]·[Cd(H2O)2(phen)2]2+·F–·0.5(SiF6)2–·9H2O (4), [Hg(phen)3]2+·(SiF6)2–·5H2O (5), [ZnBr2(phen)2] (6), 6[Zn(phen)3]2+·12Br–·26H2O (7) and [ZnI(phen)2]+·I– (8), have been synthesized and characterized by X-ray crystallography, IR spectroscopy, elemental and thermal analysis. Structural investigations revealed that metal : ligand stoichiometry in the inner coordination sphere is 1 : 2 or 1 : 3. A diversity of intra- and intermolecular interactions exists in structures of 1–8, including the rare halogen?halogen and halogen?π interactions. The thermal and spectroscopic properties were correlated with the molecular structures of 1–8. Structural review of all currently known coordination compounds of group 12 halides with bpy and phen is presented.
PROCESS FOR THE PREPARATION OF 3-BROMO - 4 - FLUOROBENZALDEHYDE
-
Page/Page column 15, (2010/08/09)
The invention relates to a process of manufacturing 3-bromo-4- fluorobenzaldehyde using zinc bromide as a catalyst.
