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.
Synthesis of eight stereoisomers of pochonicine: Nanomolar inhibition of β-N-acetylhexosaminidases
Zhu, Jian-She,Nakagawa, Shinpei,Chen, Wei,Adachi, Isao,Jia, Yue-Mei,Hu, Xiang-Guo,Fleet, George W. J.,Wilson, Francis X.,Nitoda, Teruhiko,Horne, Graeme,Van Well, Renate,Kato, Atsushi,Yu, Chu-Yi
, p. 10298 - 10309 (2013)
Pochonicine, the first naturally occurring polyhydroxylated pyrrolizidine containing an acetamidomethyl group, which was isolated from Pochonia suchlasporia var. suchlasporia TAMA 87, together with its enantiomer and their C-1 and/or C-3 epimers, have been synthesized from the sugar-derived cyclic nitrones 9D and 9L, respectively. An in-depth NMR study showed that both the 1H and 13C NMR spectra of the synthetic pochonicines (1D and 1L) matched very well with those of natural pochonicine in D2O, which unequivocally determined the relative configuration of the natural product as 1D or 1L. In addition, comparison of the optical rotations of the synthetic pochonicines and that of the natural product, but more convincingly their glycosidase inhibition profiles, confirmed the absolute configuration of natural pochonicine as 1R,3S,5R,6R,7S,7aR. Thereby, the structure of natural pochonicine was unequivocally determined as (+)-(1R,3S,5R,6R,7S,7aR)-pochonicine (1D). Glycosidase inhibition experiments showed that natural pochonicine 1D and its epimers 2D, 3D, and 4D all are powerful inhibitors of hexosaminidases (five β-N-acetylglucosaminidases and two β-N-acetylgalactosaminidases) while their enantiomers 1L, 2L, 3L, and 4L are much weaker inhibitors of the same enzymes. (-)-3-epi-Pochonicine (2L) was found to be a potent and selective inhibitor of α-l-rhamnosidase. None of the compounds showed any inhibition of α-GalNAcase.
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.
X-ray diffraction study of CsZn2Br5
Zaitseva,Kovaleva,Fedorov
, p. 840 - 841 (2009)
CsZn2Br5 crystals are studied by X-ray diffraction. The compound crystallizes in the monoclinic system with the unit cell parameters a = 6.8880(12) ?, b = 10.4703(19) ?, c = 6.5197(9) ?, β = 108.25°, V = 446.55 ?3, ρc
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.
Molecular complexes of cobalt(II) and Zinc(II) chlorides and bromides with 1-piperidinyl dimethylcarbamodithioate (L): Crystal structures of L and [ZnLBr2]
Seifullina,Khitrich,Vologzhanina
, p. 184 - 189 (2011/05/04)
Complexes of MX2(M = Co, Zn; X = Cl, Br) with 1-piperidinyl dimethylcarbamodithioate (L) of composition [MLX2] have been synthesized. The compounds have been studied by elemental analysis; X-ray diffraction; thermogravimetry; conductometry; magnetochemistry; and IR, 1H NMR, and electronic absorption spectroscopy. The ligand molecule is coordinated to the metal atoms in a bidentate chelating mode through the thione sulfur atom and the sulfenamide nitrogen atom to form a five-membered chelate ring. The structures of L and [ZnLBr2] have been determined by X-ray crystallography.
PROCESS FOR THE PREPARATION OF 3-BROMO - 4 - FLUOROBENZALDEHYDE
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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.
Synthesis, crystal structures, and thermal properties of new [ZnX 2(2,5-dimethylpyrazine)] (X = Cl, Br, I) coordination compounds
Wriedt, Mario,Jess, Inke,Naether, Christian
, p. 363 - 372 (2009/04/13)
Eight new halidozinc(II) coordination compounds with 2,5-dimethylpyrazine as a ligand were prepared. The reaction of ZnX2 (X = Cl, Br, I) and 2,5-dimethylpyrazine in methanol results in the formation of catena-(μ2-2,5-dimethylpyrazin
Investigation on the thermal decomposition some heterodinuclear Ni II-MII complexes prepared from ONNO type reduced Schiff base compounds (M II=ZnII, CdII)
Aksu,Durmus,Sari,Emreguel,Svoboda,Fuess,Atakol
, p. 541 - 547 (2008/10/09)
N,N'-bis(salicylidene)-1,3-propanediamine (LH2), N,N'-bis(salicylidene)-2,2'-dimethyl-1,3-propanediamine (LDMH2), N,N'-bis(salicylidene)-2-hydroxy-1,3-propanediamine (LOH3), N,N'-bis(2-hydroxyacetophenylidene)-1,3-propanediamine (LACH2) and N,N'-bis(2-hydroxyacetophenone)-2,2'-dimethyl-1,3-propanediamine (LACDMH 2) were synthesized and reduced to their phenol-amine form in alcoholic media using NaBH4 (LHH2, LDM HH2, LOHHH2, LACHH 2 and LACDMHH2). Heterodinuclear complexes were synthesized using Ni(II), Zn(II) and Cd(II) salts, according to the template method in DMF media. The complex structures were analyzed using elemental analysis, IR spectroscopy, and thermogravimetry. Suitable crystals of only one complex were obtained and its structure determined using X-ray diffraction, NiLACH?CdBr2?DMF2, space group orthorhombic, Pbca, a=20.249, b=14.881, c=20.565 A and Z=8. The heterodinuclear complexes were seen to be of [Ni?ligand?MX 2?DMF2] structure (ligand=LH2-, LDM H2-, LOHH2-, LACH2-, LACDMH2-, M=ZnII, CdII, X=Br-, I-). Thermogravimetric analysis showed irreversible bond breakage of the coordinatively bonded DMF molecules followed by decomposition at this temperature.
Synthesis, characterization and calorimetric study of zinc group halide adducts with aniline
da Silva Jr., Umberto G.,de Oliveira, ótom A.,de Farias, Robson F.
, p. 2 - 4 (2008/10/09)
The adducts ZnCl2·2an, ZnBr2·1.5an, CdCl2·2an, CdBr2·2an, CdI2·2an, HgCl2·2an and HgBr2·2an (where an = aniline) were synthesized and characterized by elemental analysis, infrare
