Photo-isomerization of azobenzene containing surfactants induced by near-infrared light using upconversion nanoparticles as mediator
- Here we report on photo-isomerization of azobenzene containing surfactants induced during irradiation with near-infrared (NIR) light in the presence of upconversion nanoparticles (UCNPs) acting as mediator. The surfactant molecule consists of charged head group and hydrophobic tail with azobenzene group incorporated in alkyl chain. The azobenzene group can be reversible photo-isomerized between two states: trans- and cis- by irradiation with light of an appropriate wavelength. The trans-cis photo-isomerization is induced by UV light, while cis-trans isomerization proceeds either thermally in darkness, or can be accelerated by exposure to illumination with a longer wavelength typically in a blue/green range. We present the application of lanthanide doped UCNPs to successfully switch azobenzene containing surfactants from cis to trans conformation in bulk solution using NIR light. Using Tm-3(+) or Er-3(+) as activator ions, the UCNPs provide emissions in the spectral range of 450 nm < lambda(em) < 480 nm (for Tm-3(+), three and fourHere we report on photo-isomerization of azobenzene containing surfactants induced during irradiation with near-infrared (NIR) light in the presence of upconversion nanoparticles (UCNPs) acting as mediator. The surfactant molecule consists of charged head group and hydrophobic tail with azobenzene group incorporated in alkyl chain. The azobenzene group can be reversible photo-isomerized between two states: trans- and cis- by irradiation with light of an appropriate wavelength. The trans-cis photo-isomerization is induced by UV light, while cis-trans isomerization proceeds either thermally in darkness, or can be accelerated by exposure to illumination with a longer wavelength typically in a blue/green range. We present the application of lanthanide doped UCNPs to successfully switch azobenzene containing surfactants from cis to trans conformation in bulk solution using NIR light. Using Tm-3(+) or Er-3(+) as activator ions, the UCNPs provide emissions in the spectral range of 450 nm < lambda(em) < 480 nm (for Tm-3(+), three and four photon induced emission) or 525 nm < lambda(em) < 545 nm (for Er-3(+), two photon induced emission), respectively. Especially for UCNPs containing Tm-3(+) a good overlap of the emissions with the absorption bands of the azobenzene is present. Under illumination of the surfactant solution with NIR light (lambda(ex) = 976 nm) in the presence of the Tm-3(+)-doped UCNPs, the relaxation time of cis-trans photo-isomerization was increased by almost 13 times compared to thermally induced isomerization. The influence of thermal heating due to the irradiation using NIR light was shown to be minor for solvents not absorbing in NIR spectral range (e.g. CHCl3) in contrast to water, which shows a distinct absorption in the NIR.…
Verfasserangaben: | Selina SchimkaGND, Dennis Tobias KlierGND, Anna Lopez de GuerenuORCiDGND, Philipp Bastian, Nino Lomadze, Michael Uwe KumkeORCiDGND, Svetlana SanterORCiDGND |
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DOI: | https://doi.org/10.1088/1361-648X/aafcfa |
ISSN: | 0953-8984 |
ISSN: | 1361-648X |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/30625434 |
Titel des übergeordneten Werks (Englisch): | Journal of physics : Condensed matter |
Verlag: | IOP Publ. Ltd. |
Verlagsort: | Bristol |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Datum der Erstveröffentlichung: | 31.01.2019 |
Erscheinungsjahr: | 2019 |
Datum der Freischaltung: | 15.03.2021 |
Freies Schlagwort / Tag: | azobenzene containing surfactants; kinetic of cis-trans isomerization; upconversion nanoparticles |
Band: | 31 |
Ausgabe: | 12 |
Seitenanzahl: | 9 |
Fördernde Institution: | Helmholtz Graduate School on Macromolecular Bioscience (Teltow, Germany); International Max Planck Research School on Multiscale Bio-Systems (IMPRS); German Research Foundation (SALSA) [8711110399]; Federal Institute for Materials Research and Testing (BAM) |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie | |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer Review: | Referiert |