NDLI: Photoresponsive supramolecular gels based on amphiphiles with azobenzene and maltose or polyethyleneglycol polar head

Content Provider	Royal Society of Chemistry (RSC)
Author	Tejedor, Rosa María Oriol, Luis Romero, Pilar Clemente, María José Fitremann, Juliette
Copyright Year	2015
Abstract	In the context of exploring new materials based on low molecular weight amphiphiles, we prepared a new series of photoresponsive gelators with azobenzene as photosensitive unit, D-maltose or poly(ethylene glycol) (PEG) as polar head, and L-phenylalanine as linker. The gelation properties of the final amphiphiles and the intermediate molecules have been studied in different solvents. Organogels are obtained for all of them, except for compound with PEG16 polar head. Gelation in polar solvents, as DMSO, was achieved. The morphology of supramolecular structures was characterized by electronic microscopy. The chiro-optical properties of gels, due to the supramolecular chirality imposed by the molecular chirality, were also studied. The modifications under irradiation have been monitored by UV-visible spectroscopy and electronic circular dichroism (ECD). Two of the obtained materials showed a gel–sol transition by irradiation with UV light and further thermal cis–trans isomerization to gel state at room temperature.
Starting Page	4009
Ending Page	4019
Page Count	11
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	5
Journal	New Journal of Chemistry
DOI	10.1039/c4nj02012j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Electron microscope Ethylene glycol Ultraviolet\u2013visible spectroscopy Phenylalanine DMSO Chirality Isomerization Dimethyl sulfoxide Organogels Supramolecular chirality Azobenzene Circular dichroism
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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