| Autor: |
Artem Gushchin, Maxim Sokolov, Pavel Abramov, Nina Zakharchuk, Vladimir Fedin |
| Předmět: |
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| Zdroj: |
Journal of Cluster Science; Dec2008, Vol. 19 Issue 4, p659-666, 8p |
| Abstrakt: |
Abstract Single crystals of Ta4S1.5Se7.5I8 are obtained by heating Ta, S, Se and I2 at 300 °C in 4.0:1.0:8.0:4.4 molar ratio. The structure was determined by X-ray analysis and consists of molecular clusters [Ta4(μ4-S)(μ2-QaxSeeq)4I8] (Q ≈ Se0.87S0.13). The tantalum atoms form a square with long Ta…Ta distances (3.26–3.32 Å), with four dichalcogenide ligands bridging the Ta–Ta edges and a sulfur atom capping the square. Each Ta atom has two terminal iodine atoms. Raman spectroscopy study shows the presence of the characteristic absorption band at 396 cm−1 which is due to the Ta4–μ4-S vibrations. Cyclic voltammetry shows that Ta4S1.5Se7.5I8 in solid state undergoes quasi-reversible one-electron oxidation which is metal-centered. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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