13759-87-0Relevant articles and documents
Thermochemical and structural investigations: Systems alkalimetal bromides/samarium(III)-bromid
Alsmann,Seifert
, p. 1239 - 1249 (1996)
The phase diagrams of the systems ABr/SmBr3 were reinvestigated. The findings of Blachnik for the systems with A = Cs, Rb, K were confirmed; however, the dimorphic compound K3SmBr6 is stable only above 572 K. The equilibrium temperature, found by e.m.f.-measurements in a solid state galvanic cell for the reaction KBr+K2SmBr5=L-K3SmBr6, is smaller (522 K). The formation temperature for Rb3SmBr6 is 279 K (DTA) and 256 K (e.m.f.) resp. By solution calorimetry was proved that the compounds Cs2SmBr5 and KSm2Br7 don't exist at 0 K. In the system NaBr/SmBr3 only one hitherto unknown dimorphic compound Na3SmBr3 exists above 473 K. L-Na3SmBr crystallizes in the hexagonal space group R3, above 519 K H-Na3SmBr6 has the monoclinic cryolite-structure. Powder patterns of other compounds not yet investigated - H/L-A3SmBr6, ASm2Br7 (A=Cs, Rb, K) and Cs2SmBr5 - were indexed analogously to known structure families. The structure parameters of SmBr3·6H2O were determined by single-crystal measurements.
Lanthanide containing ionic liquid crystals: EuBr2, SmBr 3, TbBr3 and DyBr3 in C12mimBr
Getsis, Anna,Mudring, Anja-Verena
, p. 1726 - 1734 (2010)
Doping the ionic liquid crystal C12mimBr with various lanthanide halides yields interesting novel liquid crystalline and luminescent materials. The thermal phase behavior of all compounds was investigated by hot-stage polarizing optical microscopy and differential scanning calorimetry and the photophysical properties were determined by luminescence spectroscopy. C 12mimBr itself is an ionic liquid crystal that shows bluish-white emission upon excitation with UV light due to transitions in the imidazolium p-system. Doping lanthanide bromides into C12mimBr with concentrations of about 1 mol-% does not affect the liquid crystalline behavior of the host materials to a great extent and room temperature liquid crystals are obtained. All materials show an appreciable luminescence. EuBr2 in C12mimBr yields a material, which shows a blue emission originating from 4f-5d-transitions. SmBr3-doped samples show a red and TbBr 3 samples a green luminescence. Upon doping C12mimBr with DyBr3 an orange luminescent liquid crystalline material is obtained. Most interestingly the emission color for the TbBr3 and DyBr 3 containing materials can be tuned from bluish-white (mainly C 12mimBr emission) to green (for TbBr3) and orange-yellow (for DyBr3) depending on the wavelength of the excitation light used.
Systematics and anomalies in rare earth/aluminum bromide vapor complexes: Thermodynamic properties of the vapor complexes LnAl3Br12 from Ln = Sc to Ln = Lu
Wang, Zhi-Chang,Yu, Jin
, p. 4248 - 4255 (2008/10/09)
Systematics and anomalies in the rare earth/aluminum bromide vapor complexes have been investigated by the phase equilibrium-quenching experiments. The measurements suggest that the LnAl3Br12 complexes are the predominant vapor compl
Carbonyl dibromide: A novel reagent for the synthesis of metal bromides and bromide oxides
Parkington, Michael J.,Ryan, T. Anthony,Seddon, Kenneth R.
, p. 257 - 261 (2007/10/03)
Carbonyl dibromide reacted with a wide selection of d- and f-block transition-metal oxides to form either the metal bromide or bromide oxide; the reactions are driven by the elimination of carbon dioxide. In a typical reaction the metal oxide was treated with an eight-fold excess of COBr2 in a sealed Carius tube at 125°C for 10 d (to ensure complete reaction of the metal oxide). As COBr2 and the reaction by-products (CO2, CO and Br2) are all volatile, the desired products were obtained in essentially quantitative yield and a high degree of purity. Under these conditions V2O5, MoO2, Re2O7, Sm2O3 and UO3 were converted into VOBr2, MoO2Br2, ReOBr4, SmBr3 and UOBr3, respectively. This route offers great potential for the preparation of many known bromide derivatives of the transition metals, lanthanides and actinides, in a very convenient manner, and also for the synthesis of new materials. A modified synthesis of carbonyl dibromide was elaborated, and its 17O NMR and electron impact mass spectra are reported for the first time.
