Chalcogenide complexes

Chalcogenide clusters have opened many avenues for their exploration [110, 111]. Starting from the 1960s, both solid-state and coordination chemists have worked extensively to enrich this field to mature enough to summarize pertinent work in this chapter [112]. In [PYjS, ], the cluster has 

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The complexes [E Au2(/r-dppf) ] (E = S, Se) also serves as building blocks for preparing polynuclear triply bridging chalcogenide complexes such as (510).2893, 94 The crystal structure of [ S(Au2PPh3)2 2Au][SnMe3Cl] (511) has been reported.2902... 

Kalinina IV, Fedin VP. Cubane chalcogenide complexes of group IV-VI metals Synthesis, structure, and properties. Russ J Coord Chem 2003 29 597-615. 

Availability of the mixed-chalcogenide complexes [Fe2(CO)6(p,-EE )] (E, E = SSe (112), STe (113), SeTe (114)) provides easy access to mixed-metal, mixed-chalcogenide clusters with the use of room-temperature conditions (Scheme 6).86... 

The first poly chalcogenide complex, K4USeg, was obtained by a solid-state reaction. It has a molecular sfructure with a distorted dodecahedral anion, [U(Se2)4] , which is isosfructural with the known peroxoanions [M(02)4]" , where M = V, Nb, Ta, Cr (n = 3) or Mo, W (n = 2). Recently, two additional uranium selenides have been synthesized, MU2Se6 (M = K+, Cs+), using a reactive flux method. The oxidation state of the uranium in these compounds was found to be tetravalent. The selenium has two distinct oxidation states, Se and one similar to a polyselenide network. 

A large number of mixed chalcogenides and ternary or more complex thallium-chalcogenide complexes have been prepared and characterized see Chalcogenides Solid-state Chemistry). 

Then the chalcogenide ions will combine with the metal ions released from the thiosulfate/selenosulfate complexes, and upon hydrolysis precipitating the corresponding chalcogenides. Due to the differences in the stabihty of the metal-chalcogenide complexes initially formed, the optimal concentrations, pH, and temperatures may vary from one chalcogenide to another. Optimal experimental conditions must be estabhshed for each system. 

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