Showing papers by "Edward I. Stiefel published in 1999"
TL;DR: A variety of transition metal dithiolene complexes have been synthesized from thiometalates via induced internal electron-transfer reactions as discussed by the authors, and these complexes are isostructural and adopt twisted trigonal prismatic coordination.
Abstract: A variety of new and known transition metal dithiolene complexes has been synthesized from thiometalates via induced internal electron-transfer reactions. Treating MS42- (M = Mo, W) with stoichiometric amounts of bis(trifluoromethyl)-1,2-dithiete ((CF3)2C2S2) results in rapid formation of the respective tris(dithiolene) complexes M(tfd)32- (tfd = [(CF3)2C2S2]2-). These complexes are isostructural and adopt twisted trigonal prismatic coordination (ca. 18° from a perfect trigonal prism). Crystal data: Mo(tfd)32-, monoclinic, space group C2/c, with a = 18.905(4) A, b = 13.732(3) A, c = 17.101(3) A, β = 110.29(3)°, and Z = 4; W(tfd)32-, monoclinic, space group C2/c, with a = 18.933(4) A, b = 13.728(3) A, c = 17.096(3) A, β = 110.26(3)°, and Z = 4. In contrast, Mo(tfd)3 (synthesized as reported previously) has nearly perfect trigonal prismatic coordination. Crystal data: hexagonal, space group P63/m, with a = 9.6795(14) A, b = 9.6795(14) A, c = 13.951(3) A, and Z = 2. Treating WOS32- and MoO2S22- with (CF3)2...
53 citations
Patent•
25 May 1999
TL;DR: In this article, a method of making an oil-soluble or oil-dispersible trinuclear molybdenum-sulfur compound, comprising of reacting two to less than three equivalents of a tetrahydrocarbyl thiuram disulfide and one equivalent of a compound containing the [Mo3S13]2- ion, was proposed.
Abstract: A method of making an oil-soluble or oil-dispersible trinuclear molybdenum-sulfur compound, comprising: reacting two to less than three equivalents of a tetrahydrocarbyl thiuram disulfide and one equivalent of a compound containing the [Mo3S13]2- ion to produce a trinuclear molybdenum compound of the formula Mo3Sx(L)4 wherein x is from 4 to 10 and L is dihydrocarbyl-dithiocarbamate.
35 citations
Patent•
13 Apr 1999TL;DR: In this article, an enhanced synthesis of transition metal dithiolene complexes is described, which is useful for selective removal and recovery of olefins from process streams containing contaminants such as CO and H2 S.
Abstract: Enhanced synthesis of transition metal dithiolene complexes is described. [1,2-bis(Trifluoromethyl)ethylene-1,2-dithiolato]nickel selectively and reversibly binds olefins (C2 to C6). Under the same conditions, the complex does not react with H2 O, C2 H2, CO, and H2, and only slowly reacts with H2 S at high concentrations. The compositions are useful for selective removal and recovery of olefins from process streams containing contaminants such as CO and H2 S.
11 citations
Patent•
15 Jun 1999
TL;DR: In this paper, a trinuclear tungsten core and a ligand or ligands capable of rendering the compound oil-soluble or oil-dispersible is provided.
Abstract: A lubricating oil composition is provided comprising a major amount of an oil of lubricating viscosity and a minor amount of, as an additive, at least one compound comprising a trinuclear tungsten core and bonded thereto a ligand or ligands capable of rendering the compound oil-soluble or oil-dispersible.
4 citations