148912 20250123152145.0 doi 10.1039/c4nj02012j sideral 90332 ART-2015-90332 eng Oriol Langa, Luis Teodoro Universidad de Zaragoza (orcid)0000-0002-0922-5615 Photoresponsive supramolecular gels based on amphiphiles with azobenzene and maltose or polyethyleneglycol polar head 2015 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. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/MINECO/MAT2011-27978-C02-01 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 3.277 2015 CHEMISTRY, MULTIDISCIPLINARY 49 / 162 = 0.302 2015 Q2 T1 0.935 2015 Chemistry (miscellaneous) 2015 Q1 Materials Chemistry 2015 Q1 Catalysis 2015 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Clemente, M.J. Universidad de Zaragoza (orcid)0000-0001-9488-6698 Tejedor, R.M. Universidad de Zaragoza (orcid)0000-0003-1141-5933 Romero, P. Universidad de Zaragoza (orcid)0000-0003-1378-0571 Fitremann, J. 2013 765 Universidad de Zaragoza Dpto. Química Orgánica Área Química Orgánica 39, 5 (2015), 4009-4019 New j. chem. NEW JOURNAL OF CHEMISTRY 1144-0546 914210 http://zaguan.unizar.es/record/148912/files/texto_completo.pdf Postprint 2617564 http://zaguan.unizar.es/record/148912/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:148912 articulos driver 2025-01-23-14:46:56 ARTICLE