A Facile Trans to Gauche Conversion in Layered Silver Butanethiolate
| Autor: | Hilary G. Fijolek, Jill R. Grohal, and Jennifer L. Sample, Michael J. Natan |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Inorganic Chemistry. 36:622-628 |
| ISSN: | 1520-510X 0020-1669 |
| Popis: | Raman, X-ray diffraction (XRD), UV−visible reflectance, and 13C and 109Ag CPMAS NMR studies have been carried out on three different forms of the layered solid AgS(CH2)3CH3: a white all-trans compound, a bright yellow gauche C(1)−C(2) conformational isomer, and a phase containing both species. The structure of these compounds comprises a slab of Ag and S atoms, alkyl chains extending in both directions, and layer stacking. Raman spectroscopy and 13C NMR show that the all-trans species is less stable, converting cleanly to the gauche form. This transformation (Ea ≈ 60 kJ/mol) is accompanied by a color change from white to yellow, a phenomenon previously observed upon melting of mesogenic AgSR (R = alkyl) compounds. XRD shows that the 15.56 A interlayer spacing in the trans form increases to 16.88 A in the gauche form. On the basis of 109Ag NMR data and bond lengths from structurally-characterized Ag thiolate model compounds, S−S spacings of 4.4−4.8 A were found, which agree with those reported for two-dim... |
| Databáze: | OpenAIRE |
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