Sulfur, selenium, and tellurium complexes

The 1 1 reaction of 76 or 77 (R = Me, R = H) with bromine resulted in oxidation and the formation of a carbene complex of SBr2 (79) or SeBr2 (80), respectively (55, 58-62). The X-ray crystal structure of 79 has been reported and showed that this sulfurane possesses an almost collinear axial three-center geometry with elongated S-Br 

Treatment of l,3-diisopropyl-4,5-dimethylimidazol-2-ylidene with SC12 and S0C12 resulted in 87 and 88, respectively (67). Complex 87 can be converted into the corresponding fluoride (89) via reaction with AgF. Surprisingly, however, reduction of the sulfur center was ob- 

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Complexes with Sulfur-, Selenium-, and Tellurium-containing Ligands 322... 

Complexes with sulfur, selenium, and tellurium donor ligands 959... 

The formation of volatile chlorotrimethylsilane is a very clean synthetic pathway to prepare several metal complexes. Various trimethylsilyl derivatives of sulfur, selenium, and tellurium have been described. 

Abel, Edward W., Orrell, Keith G., and Bhargava, Suresh, K., The Stereodynamics of Metal Complexes of Sulfur-, Selenium and Tellurium-Containing... 

O-sulfinato complex, 37 287 sulfito complexes, 37 293 sulfur, selenium, and tellurium tetrahal-ide complexes, 37 299 thiocyanato complexes, 37 264 thioether and selenoether complexes, 37 288... 

The sulfide group forms a large number of complexes where it is in chelation with a different heteroatom. Among the common heteroatoms are N, P and As. These complexes are too numerous to list here, but individual complexes can be found from Table 9 or from refs. 1224 and 1667. It is also possible to synthesize compounds which will form bi-, tri- and tetra-dentate complexes to platinum(II), where sulfur, selenium and tellurium.are the only atoms which coordinate to the metal. A review of complexes formed from ligands of the type RS(CH2) SR has been recently published.1734 This article outlines the synthesis, reactions and spectroscopy of these complexes, and allows the complexes of platinum to be placed in context with those of other transition metals. 

COMPLEXES OF GOLD(m) WITH SULFUR, SELENIUM AND TELLURIUM DONOR... 

The complete series, thio-, seleno-, and telluroformaldehyde complexes of osmium [OsCl(NO)(r72-E=CH2)(PPh3)2] (E = S, Se, Te), was obtained by reaction of the carbene complex [OsCl(NO)(=CH2)(PPh3)2] with elemental sulfur, selenium, and tellurium, respectively.53... 

COMPLEXES WITH SULFUR, SELENIUM, AND TELLURIUM DONOR ATOMS... 

Complexes with Sulfur, Selenium, and Tellurium Donors... 

Oxygen reacts with hydrogen in a ratio of one to two, as does sulfur, selenium, and tellurium. It is this chemical reactivity, the ability of elements to join chemically into compounds, that is responsible for transformation of the elements of the cosmos into the materials of Earth and ultimately the materials of life. Although we have to put off our detailed discussion of the complex molecules of life until we have a firmer foundation, we already have enough information to discuss two of the most important chemicals of life and decidedly life s necessary precursors salt and water. The first life formed in the salty oceans, as evidenced by the salty solutions of our cells, and is always present in the salty character of our bodies. 

The osmium carbyne complex 115 reacts with elemental sulfur, selenium, and tellurium to afford the complexes 135 in which the element atoms "bridge the metal-carbon triple bond [Eq. (123)] (56). Complex 115 also reacts with transition metal Lewis acids such as AgCl or Cul to give dinuclear compounds with bridging carbyne ligands. Reaction with elemental chlorine results in addition across the metal-carbon triple bond to generate the chlorocarbene osmium complex 136 [Eq. (124)]. 

Pentahalides form essentially 1 1 adducts with sulfur, selenium, and tellurium donors, including phosphine sulfides and selenides. IR, Raman (see Raman Spectroscope, and NMR studies of the complexes formed with mixed-donor 0,S ligands showed bonding to occur via sulfur exclusively. The ionic [NbCl4()] -S2R2)][NbCle] complexes are volatile and act as a single-source precursor to mixed-Nb2 05/NbS2 films... 

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