Ditellurides

Intramolecular heteroatom coordination may also influence the stabilities or structures of catenated tellurium compounds. For example, a rare example of a tritelluride, bis[2-(2-pyridyl)phenyl]tritelluride, is stabilized by a Te N contact of 2.55 The ditelluride (2-MeOCelFtCOTe) has an unusual planar structure. Although the C=0 Te interaction is longer (3.11 A) than the Me 0 contact (2.76 A), ab initio molecular orbital calculations indicate that the planarity results predominantly from the former intramolecular connection. 

By coupling the ditelluride 10 with sulfuryl chloride, l,l-dichloro-2-(4-methyl-phenyl)-3//-benzoisotellurazole was obtained [93JCS(D)619]. 

Compounds 15 can be prepared either by acylation of bis(o-aminophenyl) ditelluride (88KGS276 89KGS120) or by reduction of A -acyl-2-trichlorotelluro-benzenes with sodium sulfide (88MI1). 

Reactions of 19 are similar to those of other A-methylbenzochalcogenium salts. Under the action of NaBH419 is reduced to 3-methyl-2,3-dihydro-2-phenylbenzo-tellurazole. The alkaline hydrolysis of 19 gives rise to di(o-A-methyl-A-benzoyl-aminophenyl) ditelluride (92MI1)... 

Like lV-methyl-2-phenylbenzothiazoliiim iodide (76KGS635), the salt 19 reacts with hydrazine hydrate to give 3,6-diphenyl-l,2-dihydro-l,2,4,5-tetrazine and di(o-lV-methylaminophenyl) ditelluride (92MI1). 

Recently, a one-pot method for preparation of 2-aryl-1,5-benzotelluroazepines 60 has been developed based on the reaction of sodium 2-aminophenyltellurolate [from di(o-aminophenyl) ditelluride) with arylpropargyl aldehydes (99MI1). Considering the high affinity of supemucleophilic aryltellurolate anions to a triple bond, one may assume that at the first stage of this reaction arylvinyl tellurides 61 are formed. Cyclization of 61 spontaneously or on silica gel in a chromatographic column forms the heterocycles 60. 

H2Te (hydrogen telluride, colorless), HTe (hydrogen telluride ion, colorless), Te (telluride ion, colorless), Te (ditelluride ion, red), Te" + (tellurous ion), HTeOj (telluryl ion), HTeO (acid tellurite ion, colorless), TeO " (tellurite ion, colorless), H2Te04 (telluric acid, colorless), HTeOJ (acid tellurate ion, colorless), TeO (tellurate ion, colorless). 

Data on the electrochemistry of the telluride ion in alkaline media are relatively limited. Mishra et al. [53] studied the oxidation of Te to Te° at solid electrodes, focusing on the intermediate step(s) of this process, and in particular, the possibility of detecting ditelluride Te via rotating ring disk electrode (RRDE) methodology. Oxidation beyond the elemental state to TeO and TeO was also studied using cyclic and hydrodynamic voltammetry. 

It was observed in other works that in sulfide electrolyte, decomposition of ZnSe was still obtained stable PECs could be constructed though from singlecrystal, n-type, Al-doped ZnSe electrodes and aqueous diselenide or ditelluride electrolytes [124]. Long-term experiments in these electrolytes were accompanied by little electrode weight loss, while relatively constant photocurrents and lack of surface damage were obtained, as well as competitive electrolyte oxidation. Photoluminescence and electroluminescence from the n-ZnSe Al electrodes were investigated. 

Elhs AB, Kaiser SW, Wrighton MS (1976) Optical to electrical energy conversion Cadmium telluride-based photoelectrochemical cells employing telluride/ditelluride electrolytes. J Am Chem Soc 98 6418-6420... 

Nakamura, T., Yasuda, S., Miyamae, T., Nozoye, H., Kobayashi, N., Kondoh, H., Nakai, 1., Ohta, T., Yoshimura, D. and Matsumoto, M. (2002) Effective Insulating Properties of Autooxidized Monolayers Using Organic Ditellurides. Journal of the American Chemical Society, 124, 12642-12643. 

It has, however, also been reported that the reaction of aryl ditellurides with Ni°, Pd°, and Pt° may result in the cleavage of the carbon-chalcogen bond. The oxidative addition of... 

Diphenyldisulfide or diphenyldiselenide react with AgAsF6 in liquid S02 to give [Ag2(Ph2E2)4](AsF6)2 (E = S, Se) (222).1294 A dimeric compound has been prepared with the ditelluride, [Ag2 Te2(p-F-C6H4) 2]. 169... 

Kishore, K. and Ganesh, K Polymers Containing Disulfide, Tetrasulfide, Diselenide and Ditelluride Linkages in the Main Chain. Vol. 121, pp. 81-122. 

As with selenium analysis, HGAAS also finds a place in Te determination. Basnayake et al. amended cultures of P. fluorescens K27 with 0.1 mM tellurite and, after 92-h growth, determined that approximately 34% of added Te was present as either precipitated, elemental Te in/or on centrifuged cells the balance of added Te remained in solution.190 In this same study, GC/MS was used for determination of DMTe in the same facultative anaerobe amended with tellurate.190 Earlier, GC/MS was used to analyze the headspace of a tellurium-resistant fungus amended with tellurite.215 This last is one of the few reports of the detection of dimethyl ditelluride in microbial headspace (see below). 

Recently, Kondo and coworkers reported on the polymerization of St with diphenyl diselenides (37) as the photoiniferters (Eq. 39) [ 162]. In the photopolymerization of St in the presence of 37a and 37b, the polymer yield and the molecular weight of the polymers increased with reaction time. The chain-end structure of the resulting polymer 38 was characterized. Polymer 38 underwent the reductive elimination of terminal seleno groups by reaction with tri-n-butyltin hydride in the presence of AIBN (Eq. 40). It also afforded the poly(St) with double bonds at both chain ends when it was treated with hydrogen peroxide (Eq. 41). They also reported the polymerization of St with diphenyl ditelluride to afford well-controlled molecular weight and its distribution [163]. 

Davis, J. G. Bridenbaugh, P. M. Wagner, S. 1978. Electrical and optical properties of copper indium ditelluride crystal grown from near-stoichiometric compositions. I. Electron. Mater. 7 39-45. 

Diphenyl ditelluride adds to alkynes upon irradiation with a tungsten lamp in the absence of solvent to give 1,2-bis(phenyltelluro)alkenes (Equation (67)).191 The ( )-isomers are obtained as the major product through a radical chain mechanism. Functionalized internal alkynes such as dimethyl acetylenedicarboxylate and dihaloalkynes XCCX (X = C1 or Br) are able to participate in the reaction.192... 

Ditellurides, 24 422 Diterpene glycosides, 24 239 Diterpenoid acids, 24 552 Diterpenoids, 24 550-555 labdane family of, 24 573 Di -ferf-alkyl peroxides, 23 439-441 as free-radical initiators, 14 288... 

Molybdenum disulfide electrodes, sloping discharge curve, 3 414 Molybdenum ditelluride, 17 26 Molybdenum enzymes, 17 321 Molybdenum hexacarbonyl, 7 594 ... 

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