Thallium III bromide

Thallium(III) fluoride has been prepared by the action of fluorine or bromine trifluoride on thallium(III) oxide at 300°C. It is stable to ca 500°C but is extremely sensitive to moisture. Thallium(III) chloride can be obtained readily as the tetrahydrate [13453-33-3] by passing chlorine through a boiling suspension of HC1 in water. It can be dehydrated with thionyl chloride. Thallium(III) bromide tetrahydrate [13453-29-7] is prepared similarly, whereas the iodide prepared in this manner is thallium(I) triiodide [13453-37-7], H+Iy. 

Literature values for stability constants (153) have usually been determined for solutions much less concentrated than those needed for diffraction measurements, and the values for these solutions have to be checked by other methods. For the thallium(III) bromide complexes the stability constants for the concentrated solutions used [1-2.6 M in Tl(III)], were derived from Tl-205 NMR shift measurements. The fraction of Tl(III), bonded in each of the complexes calculated from these constants as a function of the chloride concentration (Fig. 17), shows... 

Of the thallium halide complexes, the bromide complex is the most important in extraction separations. Tl(III) and Au(IlI) are extracted quantitatively from 1-3 M HBr with diethyl ether or DIPE, or MIBK. At that concentration of HBr, Fe(lII), Ga, In, Hg, and Te are extracted in small amounts. After extraction with MIBK, Ga, In, Fe(IlI), and Sn are stripped with a 1.5 iW HBr formamide solution, leaving only Tl(III) in the ketone phase [1]. The thallium(III) bromide eomplex has been extracted with TO A in benzene [2], or n-octylaniline in CHCI3 [3],... 

Thallium(III) bromide extract in DIPE can be directly shaken with Rhodamine B in 1 M H2SO4 [22]. 

Bis(polyfluorophenyl)thallium(III) bromides with aryl groups containing two ortho-fluorine atoms undergo reductive symmetrization with Cu powder in 1,4-dioxane to produce adducts of the corresponding tris compound" ... 

In desulfination of T1 sulfinates ", bis(polyfluorophenyl)thallium(III) bromide reacts with the corresponding Ba polyfluorobenzenesulfinate to give the tris(polyfluoro-phenyl)thallium(III) ... 

Bis(/>-tetrafluorophenyl)thallium(III) bromide, (4-HC6F4)2TlBr, forms supramolecular arrays, 42, in the solid state, with unsymmetrical bromide bridging [ 150] it is believed that similar structures are likely for R2TlBr with R = C6F5 and... 

Thallium(III), particularly as the trifluoroacetate salt, is also a reactive electrophilic metallating species, and a variety of synthetic schemes based on arylthallium intermediates have been devised.75 Arylthallium compounds are converted to chlorides or bromides by reaction with the appropriate cupric halide.76 Reaction with potassium iodide gives aryl iodides.77 Fluorides are prepared by successive treatment with potassium fluoride and boron trifluoride.78 Procedures for converting arylthallium compounds to nitriles and phenols have also been described.79... 

Contrary to In3+, the heaviest d acceptor of group 3B, Tl +, is a very soft acceptor, as is evident from the stabilities of its chloride and bromide complexes (Table 2). The lower iodide complexes are not stable relative to the redox reaction producing thallium(I) and free iodine. The inherent affinity of T13+ for 1 is so strong, however, that even at rather modest concentrations of free iodide, thallium (III) is completely protected from reduction by formation of the complex Tlli (80). The value... 

Metal Halides. Reacts explosively or violently with the following calcium bromide iron(III) bromide or chloride iron(II) bromide or iodide cobalt(II) chloride silver fluoride all four mercury(II) halides copper(I) chloride, bromide or iodide copper(II) chloride and bromide ammonium tetrachlorocuprate zinc and cadmium chlorides, bromides, and iodides aluminum fluoride, chloride, and bromide thallium bromide tin(II) or (IV) chloride tin(IV) iodide arsenic trichloride and triiodide antimony and bismuth trichlorides, tribromides, and triiodides vanadium(V) chloride chromium(IV) chloride manganese(II) and iron(II) chlorides and nickel chloride, bromide, and iodide.17,22"25... 

The carboxylic acid 61 was converted to its aldehyde counterpart which, upon condensation with m-terf-butyldimethylsilyloxyphenyl-magnesium bromide, gave the alcohol 62. Conversion of the alcohol to the acetamide 63 was effected by a one-pot tosylation/sodium azide displacement, followed by hydrogenation (H2/Pd(C)/Florisil) and acetylation. Treatment of 63 by thallium(III) trifluoroacetate (TTFA)... 

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