Synthesis of Mesoporous Aluminosilicates with Enhanced Stability and Ion-Exchange Capacity via a Secondary Crystallization Route
✍ Scribed by R. Mokaya
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 199 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0935-9648
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✦ Synopsis
The Erlenmeyer condensation procedures have been modified and applied to synthesize the oxazolone compounds [25]. One equivalent of hipuric acid or its derivative, one equivalent of benzaldehyde or its derivative, one equivalent of sodium acetate, and ten equivalents of acetic anhydride were mixed and well-stirred under Ar for over 2 days. The resulting solutions were either poured into ice water and the precipitates collected by filtration, or were extracted by organic solvent and the solvent was evaporated to obtain the solid. The solid was re-dissolved in a minimum amount of acetone and was precipitated by addition of a minimum amount of water. Crystalline materials are obtained after sublimation. The yields for compounds 1±4 are over 80 %. The solution absorption and emission spectra were measured using CH 2 Cl 2 solutions. The k max value for the absorption spectrum was used as the excitation wavelengths for the emission spectra.