Separation of Tellurium from Metal Chalcogenides through Mild Anhydrous Chlorination.

The separation of tellurium from cadmium telluride is examined using a unique combination of mild, anhydrous chlorination and complexation of the subsequent tellurium tetrachloride with 3,5-di-tert-butylcatecholate ligands (dtbc). The resulting tellurium complex, Te(dtbc) , is isolated in moderate yield and features a 10 to 10 reduction in cadmium content, as provided by XRF and ICP-MS analysis. Similar results were obtained from zinc telluride.

Synthesis and Characterization of Tellurium Catecholates and Their -Oxide Adducts.

Tellurium catecholate complexes were investigated to probe the redox chemistry of tellurium, whose oxidation state can span from -2 to +6. Treating TeO with catechols resulted in tellurium coordination complexes in high yields within minutes to hours at room temperature or with extended heating, depending on the ligand substituents, giving Te(IV) complexes of the form Te(), where = 3,5-di--butylcatecholate, -catecholate, or tetrachlorocatecholate. The redox behavior of these complexes was investigated through addition of organic oxidants, giving nearly quantitative adducts of pyridine -oxide or -methylmorpholine -oxide with each tellurium complex, the latter set leading to ligand oxidation upon heating.

Three Ways Isolable Carbenes Can Modulate Emission of NH-Containing Fluorophores.

Fluorescent molecules and materials that exhibit emission changes in response to analytes are of great interest across multiple disciplines. Herein, we investigate the response of NH-containing fluorophores carbazole and 2-phenylbenzimidazole () with two representative isolable singlet carbenes. Specifically, -heterocyclic carbene 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene () and cyclic (alkyl)(amino)carbene (2,6-diisopropylphenyl)-4,4-diethyl-2,2-dimethyl-pyrrolidin-5-ylidene () were discovered to afford three different types of reaction products with carbazole and .

Insertion of sodium phosphaethynolate, Na[OCP], into a zirconium-benzyne complex.

Reaction of the zirconium-benzyne complex [CpZr(PMe)(CH)] with sodium phosphaethynolate, Na[OCP], affords a zircono-phosphaalkene complex. Notably, unlike reactions of other transition metal complexes with Na[OCP] that yield the products of simple salt metathesis, this transformation represents novel Na[OCP] insertion chemistry and formation of an unusual solid state coordination polymer. The polymer is disrupted upon addition of MeSiCl to afford a silyl-capped dimer that retains the zirconophosphaalkene functionality.