Thallium complexes bromides

The bromide-induced adsorption of thallium complex on pc-Ag electrode has been studied using CV and chronocoulome-try [125]. 

With thallium tribromide, a tetrabromothallate complex was obtained with formation of an alkyl bromide and thallium(I) bromide (47)... 

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],... 

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... 

Extrapolations within the respective groups of the Periodic Table should thus be an appropriate approach to predict the chemical behavior of superheavy elements [14]. Examples are the detailed treatments [16] of chemical and physical properties of the 7p elements 113 and 114, eka-thallium and eka-lead. Predictions of properties common to several superheavy elements were carried out for the design of group separations as a first step in chemical search experiments. Examples are the high volatility of elements 112 to 116 in the metallic state [17], or the formation of strong bromide complexes of elements 108 to 116 in solution [18]. 

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