| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - Organogel Formation by Coaggregation of AdaptableAmidocarbamates and Their Tetraamide Analogues
|
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - Mixtures of derivatives of Hanabusa's bolaamphiphilic amidocarbamates containing two Z-valinyl subunitsand aliphatic spacers that range from ethylenic to octamethylenic are able to form organogels. A coassemblyof them is observed in their acetonitrile and toluene gels; namely, the concentration of a given compoundat which a gel is formed is lowered by the presence of equimolar quantities of any other compound in theseries. The aggregates were studied by wide-angle X-ray diffraction (WAXD) and the results can berationalized if the gel fibers are formed by supramolecular copolymers. NMR studies reveal that in solutionthese molecules adopt folded conformations containing intramolecular H-bonds, but IR studies indicatethat these are not present in their aggregates. Additionally, analogues of the amidocarbamates obtainedby replacement of the carbamate functionality by amide have been shown to behave in a similar way. Forthese molecules it can be shown that the central aliphatic subunit is not completely extended in theconformations present in the aggregates according to IR and WAXD studies. The tetraamide-type compoundsdescribed are robust organogelators that form gels in a variety of organic solvents with good thermostabilityand present improved feasibility for the synthesis of envisaged functional organogelators.
|
| article type
| |
| is part of this journal
| |
