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| Titel: |
Syntheses, spectroscopic characterization, thermal behavior, electrochemistry and crystal structures of two novel pyridine metatungstates |
| Auteur: |
Niu, Jingyang Zhao, Junwei Wang, Jingping Bo, Yan |
| Verschenen in: |
Journal of coordination chemistry |
| Paginering: | Jaargang 57 (2004) nr. 11 pagina's 935-946 |
| Jaar: |
2004-07-20 |
| Inhoud: |
Two novel metatungstate compounds [Hdmpy]4H2[H2W12O40]·4H2O (dmpy = 2,6-dimethyl pyridine) (1) and [Hpy]4H2[H2W12O40] (py = pyridine) (2) have been synthesized by rational reaction, rather than hydrothermal or electrosynthetic reaction, of sodium tungstate dihydrate with 2,6-dimethyl pyridine and pyridine, respectively and characterized by IR and electronic spectroscopies, thermal behavior and electrochemistry. X-ray single-crystal structural analyses indicate that both structures consist of close-packed arrangements of the almost spherical Keggin-type anion [H2W12O40]6- with protonated 2,6-dimethyl pyridine or pyridine molecules filling the gap of the polyanions and interacting with the metatungstate anions in the mode of W-O···H-N or W-O···H-C, giving a two-dimensional network structure. The TG-DTA curves of 1 show that weight loss is divided into two stages, and reveal that the framework of the polyanion in 1 begins to decompose at 613°C. Electrochemical study shows that Compound 1 exhibits two chemically quasi-reversible one-electron reduction processes in aqueous solution (0.5 M NaCl + HCl) in the pH range 4-7. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 37 van 82 gevonden artikelen
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