13450-88-9Relevant academic research and scientific papers
71Ga NMR spectroscopy of solutions of gallium tribromide in aromatic solvents
Cerny, Zbynek,Machacek, Jiri,Fusek, Jiri,Casensky, Bohuslav,Kriz, Otamar,Tuck, Dennis G.
, p. 119 - 124 (1996)
The 71Ga NMR spectra of solutions of gallium tribromide in different aromatic solvents have been recorded, and dependences of chemical shift on concentration, temperature and solvent observed. Such effects are absent in the corresponding solutions of Me3Ga. The 71Ga chemical shift changes are consistent with the dissociation of the dimeric form of gallium tribromide to the monomer, as observed in the gas phase, but a study of effect of added H2O or Et2O indicates that solutions of gallium tribromide contain no monomeric species and the changes are best accounted for in terms of rapid chemical exchange between two different dimeric forms of gallium tribromide, one closed and the other half-open. With increasing solvating power of the aromatic solvent, the equilibrium between these dimeric structures favours the half-open solvated species.
Crystal structure and physical properties of conducting molecular antiferromagnets with a halogen-substituted donor: (EDO-TTFBr2) 2FeX4 (X = Cl, Br)
Miyazaki,Yamazaki,Aimatsu,Enoki,Watanabe,Ogura,Kuwatani,Iyoda
, p. 3353 - 3366 (2007)
The crystal structure and physical properties of radical ion salts (EDO-TTFBr2)2FeX4 (X = Cl, Br) based on halogen-substituted organic donor and magnetic anions are investigated, including the comparison with the isomorphous compounds (EDO-TTFBr 2)2GaX4 with nonmagnetic anions. The crystal structure of these four salts consists of uniformly stacked donor molecules and tetrahedral counter anions, and the Br substituents of the donor molecules are connected to halide ligands of anions with remarkably short intermolecular atomic distances. These salts show metallic behavior around room temperature and undergo a spin-density-wave transition in the low-temperature range, as confirmed with the divergence of the electron spin resonance (ESR) line width. Although close anion-anion contacts are absent in these salts, the FeCl 4 salt undergoes an antiferromagnetic transition at TN = 4.2 K, and the FeBr4 salt shows successive magnetic transitions at TN = 13.5 K and TC2 = 8.5 K with a helical spin structure as a candidate for the ground state of the d-electron spins. The magnetoresistance of the FeCl4 salt shows stepwise anomalies, which are explained qualitatively using a π-d interaction-based frustrated spin system model composed of the donor π-electron and the anion d-electron spins. Although on the ESR spectra of the FeX4 salts signals from the π- and d-electron spins are separately observed, the line width of the π-electron spins broadens under the temperature where the susceptibility deviates from the Curie-Weiss behavior, showing the presence of the π-d interaction.
Structure and properties of dibutylamine complexes with aluminum and gallium halides: The role of hydrogen bonds
Mal'kov,Petrushchenko,Minyaeva,Lebedev,Romm
, p. 563 - 569 (2006)
Reactions of aluminum and gallium halides MX3 (M = Al, Ga; X = Cl, Br) with dibutylamine in benzene solutions were studied by calorimetry, dielectrometry, and cryoscopy. The formation of molecular complexes Bu 2NH?MX3 (1:1), 2Bu2NH?MX3 (2:1) and 6Bu2NH?MX3 (6:1) was established. In the 1:1 complexes, the donor-acceptor bond is formed by the lone electron pair of the nitrogen atom and a vacant orbital of the metal. Hydrogen bonds strongly affect the structure and properties of the 2:1 and 6:1 complexes. Complexes of the composition 2Bu2NH?MX3 are present in solution as six-membered metallacycle with a four-coordinate metal atom, and the second amine molecule linked with the complex Bu2NH?MX3 with N-H???N and N-H???X hydrogen bonds. Pleiades Publishing, Inc., 2006.
[Ga51(PtBu2)14Br6] 3-: An Elementoid Gallium Cluster with Metalloid and Nonmetalloid Structural Elements
Steiner, Jochen,Stoesser, Gregor,Schnoeckel, Hansgeorg
, p. 302 - 305 (2004)
Metal or nonmetal? Gallium is a chameleon, both as an element and in a metalloid Ga51 cluster. The cluster consists of a central Ga 13, unit with the same fcc topology as the high-pressure form of Ga-IV. A second shell of Ga atoms and GaBr and GaPR2 groups binds the central core in a corset-like molecular structure (see picture).
Sinthesis and High-Pressure Behaviour of Quaternary Chalcogenide Halides M2M'X3Y (M = Zn, Cd; M' = Al, Ga, In; X = Se, Te; Y = Cl, Br, I)
Range, Klaus-Juergen,Handrick, Karin
, p. 153 - 158 (2007/10/02)
Quaternary chalcogenide halides M2M'X3Y (M = Zn, Cd; M' = Al, Ga, In; X = Se, Te; Y = Cl, Br, I) can be synthesized by heating stoichiometric amounts of the binary components MX, MY2, and M'2X3 in evacuated sealed quartz ampoules.In the case of aluminium and gallium compounds, a mixture of the M' and X elements rather than the binary compounds has been used.The products are typical tetrahedral compounds, crystallizing with either the defect wurtzite-type or the defect zinc-blende-type structure.At 25 kbar, and 1400 deg C, Cd2InSe3Cl, Cd2InSe3Br, and Cd2InSe3I transform from the defect wurtzite-type structure to quenchable high-pressure phases with defect NaCl-type structure.The retransformation to the ambient-pressure phases proceeds via intermediates having the defect zinc-blende-type structure.Some aspects of the apparent nonstoichiometry in the high-pressure phases are discussed. - Keywords: Quaternary Chalcogenide Halides, Synthesis, Crystal Structure, High-Pressure Reactions
