Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 21, Issue 10, Pages 2678-2681Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2013.03.029
Keywords
Upconversion; Triplet-triplet annihilation; POSS-core dendrimer; Dissolved oxygen
Funding
- Japan Securities Scholarship Foundation
- Grants-in-Aid for Scientific Research [25102521, 25620161, 24102001] Funding Source: KAKEN
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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. (C) 2013 Elsevier Ltd. All rights reserved.
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