Cations tellurium

Polyatomic Chalcogen Polymers and Polymeric Tellurium Cations... 

Mixed group 15 group 16 polycations are rare and tend to form clusters. For example, the arsenic-chalcogen cations [As3E4]" (E = S, Se) have polycyclic structures similar to those of the well-known isovalent species P4S3 and the bismuth-tellurium cation [Bi4Te4]" " adopts a slightly distorted cubic... 

Figure 13 Examples of extended tellurium cations based on the Te unit, (a) (Te7)[NbCl40]Cl. s (b) (Te7)[Be2Cl6]. (c) (Te7)[AsF6]2 ...

The species, SeJ and TeJ, appear to be square-planar like whose similarity is supported by theoretical calculations that treat all of them as 6-ir electron systems.The yellow selenium cation is obtained by treating elemental selenium with fluorosulfuric acid, fuming sulfuric acid, sulfur trioxide, disulfuric acid, or antimony pentafluoride. The red tellurium cation is obtained simi-larly. = ... 

Te-O bonds, 453 Te-P bonds, 454 Te-S bonds, 453 Te-Sb bonds, 456 Te-Se bonds, 453 Te-Te bonds, 454 Tellurium cations, 938-942 anions, 1349 cations, 1346-1349 Th-contaming species neutrals, 643-650 Th clusters, 650-651 Thiazyl compounds NSR N-S bonds, 420 -421 Thio-acid RC(0)SH S-C bonds, 438 S-H bonds, 438 Thio-aldehydes RC(S)H C-H bonds, 125 Thio-amides RC(S)NR2 ... 

Like the halogen cations, the sulfur, selenium, and tellurium cations are highly electrophilic and undergo disproportionation in media with any appreciable basic properties, although, as would be anticipated, the ease of disproportionation increases in series tellurium < selenium < sulfur. 

Palladium-tellurium cationic intermediates 173,174, and 175 were observed in the mass spectra. It has been su ested that these were formed by ionization of the neutral species LnPdCl2. Several alkynylcopper species of type 177 were detected with the characteristic Cu isotopic pattern. Negative ion-mode ESI-MS( ) monitoring of the reaction failed to reveal any metal anions. 

Pentacarbonyliron is involved in the conversion of the [Tc4] into the polymeric [Tey] cation (Equation (5)). The fate of the iron carbonyl was not clear however, evidence suggested the formation of iron carbonyl-tellurium cations in solution. 

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