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dc.contributor.authorMazur , Leszek Mateusz
dc.contributor.authorRoland, Thomas
dc.contributor.authorLeroy-Lhez, Stephanie
dc.contributor.authorSol, Vincent
dc.contributor.authorSamoc, Marek
dc.contributor.authorSamuel, Ifor David William
dc.contributor.authorMatczyszyn, Katarzyna
dc.date.accessioned2020-03-05T00:31:59Z
dc.date.available2020-03-05T00:31:59Z
dc.date.issued2019-05-16
dc.identifier.citationMazur , L M , Roland , T , Leroy-Lhez , S , Sol , V , Samoc , M , Samuel , I D W & Matczyszyn , K 2019 , ' Efficient singlet oxygen photogeneration by zinc porphyrin-dimers upon one- and two-photon excitation ' , Journal of Physical Chemistry B , vol. 123 , no. 19 , pp. 4271-4277 . https://doi.org/10.1021/acs.jpcb.8b12561en
dc.identifier.issn1520-6106
dc.identifier.otherPURE: 258133369
dc.identifier.otherPURE UUID: aee5640a-1c67-4be7-8651-6d69c6b9ba1d
dc.identifier.otherScopus: 85065842179
dc.identifier.otherWOS: 000468369000011
dc.identifier.urihttps://hdl.handle.net/10023/19600
dc.descriptionFunding: UK EPSRC (EP/L017008/1), IDWS acknowledges a Royal Society Wolfson Research Merit Award. This work is a part of the ITN-EJD-2017 project POLYTHEA which has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement 764837.en
dc.description.abstractThe development of photodynamic therapy at depth requires photosensitizers which have both sufficient quantum yield for singlet oxygen generation and strong two photon absorption. Here we show that this can be achieved by conjugated linkage of zinc porphyrins to make dimers. We determined the quantum yield of generation of 1O2, φΔ , by measuring emission at 1270 nm using a near infra-red streak camera and found it to increase from 15% for a single porphyrin unit to 27 47% for the dimers with a conjugated linker. Then, we measured the spectra of two-photon absorption cross section, σ2, by a focus-tunable Z scan method, which allows for nondestructive investigation of light-sensitive materials. We observed a strong enhancement of the two photon absorption coefficient in the dimers, especially those with an alkyne linker. These results lead to an excellent figure of merit for two photon production of singlet oxygen (expressed by the product σ2xφΔ) in the porphyrin dimers, of around 3700 GM, which is very promising for applications involving treatment of deep tumors by photodynamic therapy.
dc.format.extent7
dc.language.isoeng
dc.relation.ispartofJournal of Physical Chemistry Ben
dc.rights© 2019, American Chemical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acs.jpcb.8b12561en
dc.subjectQC Physicsen
dc.subjectRC0254 Neoplasms. Tumors. Oncology (including Cancer)en
dc.subjectNDASen
dc.subjectSDG 3 - Good Health and Well-beingen
dc.subject.lccQCen
dc.subject.lccRC0254en
dc.titleEfficient singlet oxygen photogeneration by zinc porphyrin-dimers upon one- and two-photon excitationen
dc.typeJournal articleen
dc.contributor.sponsorEPSRCen
dc.contributor.sponsorThe Royal Societyen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Centre for Biophotonicsen
dc.identifier.doihttps://doi.org/10.1021/acs.jpcb.8b12561
dc.description.statusPeer revieweden
dc.date.embargoedUntil2020-03-05
dc.identifier.grantnumberep/l017008/1en
dc.identifier.grantnumberen


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