Development of a Dual‐Fluorescence Emission Sensor Based on Photo‐Induced Electron Transfer and Aggregation‐Induced Emission Enhancement for Detection of Water

  • Yousuke Ooyama
    Department of Applied Chemistry Graduate School of Engineering Hiroshima University, 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
  • Ryosuke Nomura
    Department of Applied Chemistry Graduate School of Engineering Hiroshima University, 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
  • Toshiaki Enoki
    Department of Applied Chemistry Graduate School of Engineering Hiroshima University, 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
  • Rizumu Sagisaka
    Department of Applied Chemistry Graduate School of Engineering Hiroshima University, 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
  • Nao Tsunoji
    Department of Applied Chemistry Graduate School of Engineering Hiroshima University, 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
  • Joji Ohshita
    Department of Applied Chemistry Graduate School of Engineering Hiroshima University, 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan

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<jats:title>Abstract</jats:title><jats:p>We have designed and developed a tetraphenylethen (TPE)‐anthracene‐(aminomethyl)phenylboronic acid ester (AminoMePhenylBPin) structure <jats:bold>RN‐1</jats:bold> possessing PET (photo‐induced electron transfer) and AIEE (aggregation‐induced emission enhancement) characteristics as a fluorescent sensor for detection of water in organic solvents. It was found that the appearance of fluorescence band in the low water content region is attributed to the fluorescence emission originating from the anthracene skeleton due to the formation of PET inactive species <jats:bold>RN‐1(H<jats:sub>2</jats:sub>O)</jats:bold> by the addition of water molecules. Moreover, the appearance of broad fluorescence band in the high water content region is attributed to the AIEE characteristic due to restricted intramolecular rotation (RIR) of TPE unit associated with the aggregate formation (<jats:bold>RN‐1(H<jats:sub>2</jats:sub>O)‐A</jats:bold>). This work proposes that the PET/AIEE hybrid fluorescence sensor can act as a dual‐fluorescence emission sensor for detection of water in low water content region and high water content region in solvents.</jats:p>

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