{"title":"A molecular wire: Electron transfer in an acridinium-based triad in various media","authors":"Michael S. Elioff , Jingqiu Hu","doi":"10.1016/j.jphotochem.2024.116246","DOIUrl":null,"url":null,"abstract":"<div><div>A novel acridinium-anilide-bithiophene triad (<strong>1</strong>) was synthesized and the intramolecular photoinduced electron transfer (PET) in the triad was investigated in various media. In the triad, the acridinium (Ac) is the electron acceptor and the chromophore. The bithiophene and anilide are electron donors. The lifetimes of the charge-shift state (CSH) emission varied from picoseconds in organic solvents to the nanosecond time domain in solid matrix. Long-lived charge separation transient species in the 200-microsecond time domain were observed in a solid glass matrix based on laser flash photolysis experiments. Polymeric media and solid glass matrices were observed to significantly slow the back-electron transfer of the CSH, resulting in stronger CSH emission and longer lifetimes.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"462 ","pages":"Article 116246"},"PeriodicalIF":4.1000,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Photochemistry and Photobiology A-chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1010603024007901","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
A novel acridinium-anilide-bithiophene triad (1) was synthesized and the intramolecular photoinduced electron transfer (PET) in the triad was investigated in various media. In the triad, the acridinium (Ac) is the electron acceptor and the chromophore. The bithiophene and anilide are electron donors. The lifetimes of the charge-shift state (CSH) emission varied from picoseconds in organic solvents to the nanosecond time domain in solid matrix. Long-lived charge separation transient species in the 200-microsecond time domain were observed in a solid glass matrix based on laser flash photolysis experiments. Polymeric media and solid glass matrices were observed to significantly slow the back-electron transfer of the CSH, resulting in stronger CSH emission and longer lifetimes.
期刊介绍：
JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds.
All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor).
The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.
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