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Issue 5, 2015
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Photoresponsive supramolecular gels based on amphiphiles with azobenzene and maltose or polyethyleneglycol polar head

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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.

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

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Publication details

The article was received on 11 Nov 2014, accepted on 05 Mar 2015 and first published on 06 Mar 2015


Article type: Paper
DOI: 10.1039/C4NJ02012J
Author version available: Download Author version (PDF)
Citation: New J. Chem., 2015,39, 4009-4019
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    Photoresponsive supramolecular gels based on amphiphiles with azobenzene and maltose or polyethyleneglycol polar head

    M. J. Clemente, R. M. Tejedor, P. Romero, J. Fitremann and L. Oriol, New J. Chem., 2015, 39, 4009
    DOI: 10.1039/C4NJ02012J

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