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- W2950932321 abstract "Extended X-ray absorption fine structure (EXAFS) and S K-edge absorption studies of the amorphous tungsten sulfide, WS5, and EXAFS studies of the amorphous tungsten selenide, WSe5, suggest these compounds can be formulated as WV(S22–) and WV(Se22–)2.5. The observed metal–metal distances of ca. 2.75 A are consistent with the formation of a metal–metal bond between these d1 metal centres; the metal–metal bond would explain the observed diamagnetism of these compounds. The Se—Se bond length of 2.34 A, determined from the Se K-edge EXAFS studies, is typical of a diselenide group. Comparison of the S K-edge absorption spectrum for WS5 with spectra from related compounds suggests that the sulfur is in the –1 oxidation state. This is in agreement with the observed absorption in the infrared at 518 cm–1 which we assign to an S–S stretch in a disulfide group. The S K-edge absorption spectrum of WS3 suggests that this compound contains both S–I and S–II. W LIII-edge EXAFS studies of WS3 show much greater disorder in the W—S bonding than in WS5, which can be attributed to the presence of sulfur in two oxidation states. Models based on two possible formulations, WV(S2–)2(S22–)0.5 and WIV(S2–)(S22–), give almost equally good fits to the experimental data. The observed diamagnetism of WS3 can be explained by the formation of W—W bonds of ca. 2.75 A, which are found in the EXAFS studies. Possible structural models for WS5 and WSe5 are presented." @default.
- W2950932321 created "2019-06-27" @default.
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- W2950932321 date "2010-08-04" @default.
- W2950932321 modified "2023-09-25" @default.
- W2950932321 title "ChemInform Abstract: Extended X-Ray Absorption Fine Structure Studies of the Amorphous Tungsten Sulfides and Selenides, WS5, WSe5 and WS3." @default.
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- W2950932321 doi "https://doi.org/10.1002/chin.199641001" @default.
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