Rhenium selenides

The compounds ReSe2(cr) and Re2Sc7(cr) have been reported. No experimental thermodynamic information is available but enthalpies of formation and standard entropies have been estimated by Mills [74MIL], No values are selected by the review. 

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One of the stimuli for studying these complexes is their close relationship to the well-known Chevrel phases MMo Yg (Y = S, Se or Te). Accordingly, a noteworthy recent development is the discovery of octahedral rhenium-selenide clusters. The phase Re SegClj has been prepared by the high temperature reaction ( BOOK) of ReQj with mixtures of Re and Se. An X-ray crystal structure has shown the presence of the [RcgScg] core possessing Re—Re distances of 2.6 2.67 A. The presence of two terminal Re—Cl bonds tram to one another) inhibits interlayer linkages. ... 

Rhenium Sulfides and Selenides.208 209 These catalysts are characterized by their outstanding resistance to poisoning and minimal tendency to cause the hydrogenolysis of carbon-sulfur bonds than the base metal sulfides. Rhenium heptasulfide is easily prepared from boiling 6M hydrochloric acid solutions of perrhenate with hydrogen sulfide. It has been noted that occasional exposure of the dried, powdered catalyst to the atmosphere is not deleterious. 

Compounds Bis-dimethylstibinyl oxide Bis(dimethylthallium) acetylide Butyllithium Nonacarbonyldiiron Octacarbonyldicobalt Pentacarbonyliron Tetracarbonylnickel Dibismuth trisulphide Dicaesium selenide Dicerium trisulphide Digold trisulphide Europium (II) sulphide Germanium (II) sulphide Iron disulphide Iron (II) sulphide Manganese (II) sulphide Mercury (II) sulphide Molybdenum (IV) sulphide Potassium sulphide Rhenium (VII) sulphide Silver sulphide Sodium disulphide Sodium polysulphide Sodium sulphide Tin (11) sulphide Tin (IV) sulphide Titanium (IV) sulphide Uranium (IV) sulphide ... 

The a-furildioxime method has been used for determining nickel in silicate and sulphide minerals [16], tungsten selenide [83], steel [16], indium and aluminium [84], cadmium [85], alkalis [3], beryllium [86], rhenium [87], compounds of rare-earth elements [88,89], petroleum products [90], and boiler water [91]. 

Linkage scheme in the anionic Ternary sulfides of rhenium Ternary selenides of... 

This approach has been fashioned in the pursuit of molecular rhenium chalcogenide clusters whose structures have not been accessible by conventional self-assembly techniques. The method, which has been termed cluster excision, involves the addition of a suitable ligand to the nonmolecular solid, such that the vacant sites on the metal centers will be occupied upon cleavage of the bridging interactions. Ligands that have been utilized in this approach include Cl and CN , affording molecular rhenium sulfide and selenide clusters (Equation (21)). This method also allows access to previously known structures under milder synthetic conditions ... 

In contrast to the synthetic accessibility of the above complexes using solution approaches, the synthesis of octahedral rhenium chalcogenide clusters requires the implementation of high temperature solid-state reactions, or the conversion of cluster-containing solids into soluble molecular species by the methods of cluster excision or dimensional reduction (see Section 7.2.2.1.8). While cluster excision has produced the mixed sulfide(selenide)-chloride clusters [Re6E4+ Clio 2 ] " ( = 1-3), the latter approach has led to the isolation of complexes with rhenium-chalcogenide cores [RegEgXg] - (E = S, Se X = C1, Br, I). 

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