Chromium complex tellurium

Diethyl(ethylene)tellurourea formed complexes with chromium, molybdenum, tungsten, and manganese carbonyls, in which the tellurium is coordinated to the transition metal1. The solid complexes are moderately stable in air. They do not decompose when stored in the dark at 20° under an inert atmosphere. A toluene solution of the chromium complex at 20° deposited tellurium forming the chromium-carbene complex1. 

Hexavalent chromium, 19 217 Hexavalent plutonium cations, 19 692 Hexavalent tellurium, 24 414 Hexavalent uranium coordination complexes, 25 434... 

Pentacarbonyl(tetrahydrofuran)chromium and -tungsten in tetrahydrofuran exchange the tetrahydrofuran ligands for bis[trimethylstannyl] tellurium when the reagents are stirred for 2 h at 20° in the dark. The new complexes, isolated in yields not higher than 45%, are recrystallized from pentane at — 40°3 4. 

Bis[dw-butyLphosphano] tellurium replaces norbornadiene, cycloheptatriene, acetonitrile, and dimethyl(methylene)oxosulfurane in chromium, molybdenum, and tungsten complexes. The P —Te compound acts as a bidentate ligand with the two phosphorus atoms coordinated to the metal atom1. The tetracarbonylchromium complex [R = CH(CH3)J can be recrystallized without loss of tellurium2. 

Bis[trifluoromethyl]phosphino methyl tellurium replaced tetrahydrofuran in tetrahydro-furan(pentacarbonyI)chromium when the reagents were combined at — 196° under an atmosphere of nitrogen in tetrahydrofuran as the reaction medium. Warming the mixture to room temperature, removing the solvent under a vacuum, and distilling or subliming the residue yielded analytically pure complexes. The entire procedure must be carried out in the dark. 

Backed by the same advantages of ILs as a reaction medium, i.e. strong surface binding and the high-temperature operating window, microwave-assisted synthesis of single-crystalline tellurium nanorods and nanowires has been reported recently [38]. Monodisperse chromium nanoparticles could be made by thermolysis of a Fischer carbene complex [39]. 

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