Thallium chalcogenides

A large number of mixed chalcogenides and ternary or more complex thallium-chalcogenide complexes have been prepared and characterized see Chalcogenides Solid-state Chemistry). 

M.A. McGuire, T.K. Reynolds, F.J. DiSalvo, Exploring thallium compounds as thermoelectric materials seventeen new thallium chalcogenides. Chem. Mater. 17, 2875-2884 (2005)... 

The binary compounds of the Group 13 metals with the elements of Group 15 (N, P, As, Sb, Bi) are stmcturally less diverse than the chalcogenides just considered but they have achieved considerable technological application as III-V semiconductors isoelectronic with Si and Ge (cf. BN isoelectronic with C, p. 207). Their stmctures are summarized in Table 7.10 all adopt the cubic ZnS stmcture except the nitrides of Al, Ga and In which are probably more ionic (less covalent or metallic) than the others. Thallium does not form simple compounds... 

Basically, when analysing the band structures, the equivalent observations apply to typical solid state compounds like thallium halides and lead chalcogenides. In studies on the origin of distortion in a-PbO, it was found that the classical theory of hybridization of the lead 6s and 6p orbitals is incorrect and that the lone pair is the result of the lead-oxygen interaction [44]. It was also noted... 

Thallium(I) thiolates form polymers, often with complex structures. Thus TlSPh is ionic and best described as [Tl7(SPh)6]+[Tl5(SPh)6], while TISBu is an octameric cage.58 Numerous anionic polychalcogenide complexes are known, such as [Tl2Te2]2 and [T12(S4)2]2 (6-XXV).59 As expected for a soft metal, Tl—chalcogenide bonds are strong and highly covalent. 

There are several early reports that describe the synthesis and characterization of monomeric [Tl(l,l-S2PEt2)] and dimeric [T1(1,1-S2CNR2)]2 [R = Me, Et, -Pr, i-Pr, n-Bu or i-Bu) thallium (I) adducts.The synthesis of the first thallium(I) polysufides and chalcogenide cages has been described. The two-coordinate T1(I) compound [Pt2Tl(/i3-S)2(PPh3)4]X (X = NO3 or PFg)... 

The earliest ° T1 NMR solid state studies were of the common thallium salts in both the solid phase and the melt, and of thallium silicate, borate and chalcogenide glasses. The ° T1 NMR literature up to 1988 has been extensively reviewed by Hinton et al. (1988). The chemical shift data for a number of thallium compounds are presented in Table 9.11. In view of the large CSA values which can occur in T1 compounds, distortion of the lineshapes can occur by loss of signal during the probe deadtime. Some of the earlier ° T1 NMR data may be corrupted in this way, and should be treated with caution. 

The study of some systems such as chalcogenides of zinc, cadmium, mercury, thallium, bismuth, etc. (binary or multicomponent) can be achieved in "low temperature" cell. In this case the calcium chloride (CaCb) is dissolved in glycerol between 40 and 180°C. Calcium... 

Hoang, K., Mahanti, S. D. (2008). Atomic and electronic stmctures of thallium-based III-V-VI2 ternary chalcogenides Ab initio calculations. Physical Review B, 77, 205107. 

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