Polyselenides synthesis

The synthesis, structural characterization and coordination chemistry of polyselenides, Se, and polytellurides, Te t , is a burgeoning field which has sprung into prominence during the past decade. The seminal studies by E. Zintl and his... 

Sharp KW, Koehler WH (1977) Synthesis and characterization of sodium polyselenides in liquid ammonia solution. Inorg Chem 16 2258-2265... 

In analogy to the case of stable silanethione 4, kinetic stabilization of a silaneselone by the large Tbt group was examined (see Section II.C.3). Since the synthesis and isolation of the cyclic polyselenides Tbt(R)SiSe4 (R = Mes or Tip) were unsuccessful, probably due to their lower stabilities than those of the corresponding tetrathiasilolanes such as 91... 

Although Se and Te analogues of polysulfanes do not extend beyond the poorly characterized H2Se2 and H2Te2, the chemistries of polyselenides, polytellurides and their metal complexes are well established. Equations 16.44—16.47 illustrate preparations of salts of [Se ] and [Te ] see Section 11.8 for details of crown ethers and cryptands. Solvothermal conditions may also be used for the synthesis of [Se ] and [Te ] anions. For example, when CS2CO3 and Se react in superheated MeOH solution, the CS2CO3 facilitates the disproportionation of Se to and 0x0-... 

Molten alkali-metal polyselenide fluxes also prove to be useful in the syntheses of unusual quaternaries, here illustrated by the synthesis of the onedimensional polyselenide K3CuNb2Sei2-Both of these polychalcogenides are synthesized at 870° or above. The use of low temperatures (< 450°) is not a necessary condition for the synthesis of metal polychalcogenides, as has been implied. ... 

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