title: Hypoxic condition-selective upconversion via triplet-triplet annihilation based on POSS-core dendrimer complexes.
abstract: The influence on the efficiencies of the triplet-triplet annihilation (TTA)-supported upconversion by oxygen under biomimetic conditions was investigated. From the solution containing the dendrimer complexes based on polyhedral oligomeric silsesquioxane (POSS)-core dendrimer with the Pt complex of octaethylporphyrin (PtOEP) and anthracene in PBS, the fluorescence emission of anthracene depending on the dissolved oxygen (DO) concentrations via the TTA-supported upconversion was obtained with the excitation light at 540 nm. In particular, we observed strong emission only under hypoxic conditions. In addition, it was found that the emission intensity via TTA-supported upconversion can be reversibly regulated by the DO concentrations in the solution.
authors.affiliation: Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tanaka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Okada
authors.forename: Wataru
authors.initials: W
authors.lastname: Ohashi
authors.forename: Jong-Hwan
authors.initials: JH
authors.lastname: Jeon
authors.forename: Kenichi
authors.initials: K
authors.lastname: Inafuku
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Chujo
mesh_terms: D015687:Cell Hypoxia / Q000502:physiology*; D050091:Dendrimers / Q000138:chemical synthesis / Q000737:chemistry*; D006801:Humans; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D013050:Spectrometry, Fluorescence
chemical_list: D050091:Dendrimers; D049408:Luminescent Agents