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Description:

In this study, we employ a strategy to isolate and wrap a phosphorescent Pt(II)-porphyrin core with bulky yet flexible branched alkyl chains, resulting in a solvent-free liquid at room temperature that demonstrates excellent properties for sensing oxygen (O2) gas. Compared to reference material composed of Pt(II)-tetraphenylporphyrin and a highly gas-permeable polymer matrix, our Pt(II)-porphyrin liquid shows comparable sensitivity, better linearity, and greater photostability in its O2-responsive phosphorescence. This is attributed to the high homogeneity and gas solubility of the liquids, as well as to the shielding of luminescent-core units by bulky alkyl chains. The liquid nature of the materials allows for ratiometric sensing, where the compatibility of a phosphorescent Pt(II)-porphyrin liquid (O2-sensitive) and a fluorescent alkyl-pyrene liquid (O2-insensitive) enables reproducible monitoring of O2 concentration without specific calibration. Indeed, these results highlight the significant benefits of core-isolated luminescent liquids in diverse sensing applications.

Rights:

• https://creativecommons.org/licenses/by-nc/3.0/
  

Keyword: alkyl-π liquids, optical gas sensing, phosphorescence, Pt(II)-porphyrin, oxygen sensing, ratiometric sensing

Date published: 2026-01-22

Publisher: Royal Society of Chemistry (RSC)

Journal:

• Chemical Science (ISSN: 20416520) vol. 17 issue. 12 p. 5934-5943

Funding:

• Japan Society for the Promotion of Science JP24H01733
• Japan Society for the Promotion of Science JP18H03922
• Japan Society for the Promotion of Science JP25H01264

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1039/d5sc08398b

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Updated at: 2026-04-01 13:35:44 +0900

Published on MDR: 2026-04-01 16:26:13 +0900