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Issue 43, 2020
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A conjugated porphyrin as a red-light sensitizer for near-infrared emission of ytterbium(iii) ion

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Abstract

A conjugated porphyrin with broader absorption in the visible region was synthesized for sensitizing the near-infrared emission of ytterbium(III) ions. The 4-ethynylbenzoic acid was linked to the meso position of a 5,15-dimesitylporphyrin resulting in a conjugated porphyrin, which has strong absorption in the visible region with an onset of up to 670 nm. After forming a complex with ytterbium(III) acetate and 1,10-phenanthroline in sulfolane, the absorption edge shifted to ∼650 nm with a peak absorption at 615 nm. It was found the fluorescence from porphyrin in the visible region was almost diminished in the complex. Upon excitation at a wavelength above 600 nm, the complex showed characteristic emission at 980 nm from ytterbium(III) ions with a lifetime of 12.0 μs in dichloromethane. The NIR emission was also observed in DMSO/water (1 : 1) upon excitation at 633 nm, demonstrating its potential for biological applications.

Graphical abstract: A conjugated porphyrin as a red-light sensitizer for near-infrared emission of ytterbium(iii) ion

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Supplementary files

Article information


Submitted
13 Aug 2020
Accepted
12 Oct 2020
First published
19 Oct 2020

New J. Chem., 2020,44, 18756-18762
Article type
Paper

A conjugated porphyrin as a red-light sensitizer for near-infrared emission of ytterbium(III) ion

D. Balasooriya, B. Liu, H. He, A. Sykes and P. S. May, New J. Chem., 2020, 44, 18756
DOI: 10.1039/D0NJ04910G

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