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<p>The formation of supramolecular assemblies driven by H-bonding was compared between mono- and di-substituted difluoroboron β-diketonate (DFB) derivatives. Fluorescence anisotropy measurements were utilized to assess the presence of intramolecular energy transfer between the two DFB units in dilute solution. Once organized into supramolecular assemblies, the energy transfer efficiency is further enhanced with an anisotropy value <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43630_2025_780_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="27" /> </InlineMediaObject> <EquationSource Format="TEX">\(\langle r\rangle\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">⟨</mo> <mi>r</mi> <mo stretchy="false">⟩</mo> </mrow> </math></EquationSource> </InlineEquation> as low as 5 × 10<sup>–3</sup>. Moreover, the photosensitivity of the molecular material was demonstrated with a hypsochromic emission shift upon UV exposure. The combination of time-resolved fluorescence measurements and image analysis by fluorescence and atomic force microscopy revealed the breaking of H-bonds and the rearrangement of molecules into radial aggregates at the origin of the emission shift.</p>

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Energy transfer and photosensitivity of supramolecular nanowires based on bichromophoric difluoroboron β-diketonate compounds

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Joy Ann Panis,
  • Marine Louis,
  • Arnaud Brosseau,
  • Clémence Allain,
  • Rémi Métivier,
  • Tsuyoshi Kawai

摘要

The formation of supramolecular assemblies driven by H-bonding was compared between mono- and di-substituted difluoroboron β-diketonate (DFB) derivatives. Fluorescence anisotropy measurements were utilized to assess the presence of intramolecular energy transfer between the two DFB units in dilute solution. Once organized into supramolecular assemblies, the energy transfer efficiency is further enhanced with an anisotropy value \(\langle r\rangle\) ⟨ r ⟩ as low as 5 × 10–3. Moreover, the photosensitivity of the molecular material was demonstrated with a hypsochromic emission shift upon UV exposure. The combination of time-resolved fluorescence measurements and image analysis by fluorescence and atomic force microscopy revealed the breaking of H-bonds and the rearrangement of molecules into radial aggregates at the origin of the emission shift.