Improvement of molecular gel formation efficiency by adjusting preorganization of amino acid-derived flexible molecules. A NMR and thermodynamic study
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Altres documents de l'autoria: Angulo-Pachón, César A.; Gascó-Catalán, Carolina; Ojeda, Juan José; Miravet, Juan
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
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Improvement of molecular gel formation efficiency by adjusting preorganization of amino acid-derived flexible molecules. A NMR and thermodynamic studyData de publicació
2016Editor
WileyISSN
1439-4235; 1439-7641Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://onlinelibrary.wiley.com/doi/10.1002/cphc.201600015/fullParaules clau / Matèries
Resum
The efficiency of the formation of molecular gels of simple de-rivatives of l-valineand l-isoleucine is greatl yimproved in dif-ferent organic solvents when ahexyl fragment is replaced byabulkier cyclohexyl one. Astudy ... [+]
The efficiency of the formation of molecular gels of simple de-rivatives of l-valineand l-isoleucine is greatl yimproved in dif-ferent organic solvents when ahexyl fragment is replaced byabulkier cyclohexyl one. Astudy using NMR and IR spectrosco-py provides information on the preferred conformation softhemolecules, indicat ing that the cyclohexyl moiety preclud es in-tramolecular Hbondingand preorganises the system for inter-molecular interactions, which are responsible for fiber forma-tion. NMR data of the gels provides thermod ynamic data on fi-brillization, revealing that the origin of this effect is mainly en-tropic. Electron microscopy (SEM and TEM) images show fibril-lar and tape-like objects, which are observed commonly inmolecular gels. Rheological measurements revealsignificantdifferences between cyclohexyl and hexyl appendedgelators.These findings could contribute to the rational design of small,flexible, buildingblocks forself-assembly [-]
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ChemPhysChem 2016, 17,2008 –2012Drets d'accés
© 2016 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim
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info:eu-repo/semantics/openAccess
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info:eu-repo/semantics/openAccess
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