Study of the effect of polymorphism on the self-assembly and catalytic performance of an l -proline based molecular hydrogelator
| Autor: | Cristina Berdugo, Santiago Díaz-Oltra, Juan F. Miravet, Beatriu Escuder |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Circular dichroism
technology industry and agriculture Supramolecular chemistry Cyclohexanone General Chemistry Catalysis Reaction rate 4-nitrobenzaldehyde chemistry.chemical_compound Crystallography chemistry Aldol reaction Polymorphism (materials science) Self-healing hydrogels Materials Chemistry proline hydrogel cyclohexanone |
| Zdroj: | New Journal of Chemistry. 39:3785-3791 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/c5nj00072f |
| Popis: | An exhaustive study of the polymorphism found for aggregates and hydrogels of an L-proline based hydrogelator under different preparation conditions is undertaken. The effect of heating temperature, aging time, ultrasound and pH switching on the self-assembly in water has been studied. WAXD analysis of the freeze-dried materials revealed the presence of four polymorphs, three of which could be isolated under specific conditions. Polymorphic differences have been studied by DSC, FTIR, circular dichroism and electron microscopy. Furthermore, the catalytic activity of each polymorph has been tested for the direct aldol reaction between cyclohexanone and 4-nitrobenzaldehyde revealing differences in the reaction rates that could be attributed to differences in molecular packing and aggregate morphology among them. The current study highlights the role that polymorphism plays in the application of functional supramolecular soft materials. This work was supported by the Ministry of Economy and Competitiveness of Spain (Grant CTQ2012-37735 and an FPI fellowship for C.B.), Universitat Jaume I (Grant P1-1B2013-57) and COST Action CM1005 “Supramolecular Chemistry in Water”. |
| Databáze: | OpenAIRE |
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