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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Fluorinated diphenylpolyenes: crystal structures and emission properties.

Yoriko Sonoda1, Midori Goto, Seiji Tsuzuki

  • 1Nanotechnology Research Institute and Technical Center, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan. y.sonoda@aist.go.jp

The Journal of Physical Chemistry. A
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Fluorinated diarylhexatrienes exhibit substituent-dependent solid-state fluorescence. Crystal packing and intermolecular interactions, particularly pi-pi stacking, influence emission properties, leading to monomer, aggregate, or excimer formation.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • 1,3,5-Hexatrienes are conjugated systems with interesting photophysical properties.
  • Fluorine substitution can significantly alter molecular and solid-state characteristics.
  • Understanding structure-property relationships is crucial for designing new materials.

Purpose of the Study:

  • To synthesize and characterize a series of fluorinated (E,E,E)-1,6-diaryl-1,3,5-hexatrienes.
  • To investigate the influence of fluorine substitution on absorption and fluorescence spectra in solution and solid states.
  • To correlate crystal packing and intermolecular interactions with observed photophysical behavior.

Main Methods:

  • Synthesis of fluorinated diarylhexatrienes.
  • UV-Vis absorption and fluorescence spectroscopy in solution and solid state.
  • Single-crystal X-ray diffraction analysis.
  • Fluorescence lifetime and quantum yield measurements.

Main Results:

  • Solution spectra showed minimal dependence on fluorine substitution.
  • Solid-state spectra exhibited red-shifts and strong substituent dependence.
  • Emission originated from monomeric species, molecular aggregates, or excimers depending on the crystal structure.
  • Crystal packing varied significantly with fluorine substitution, influencing intermolecular interactions (pi-pi stacking).

Conclusions:

  • Fluorine substitution profoundly impacts solid-state photophysics of diarylhexatrienes.
  • Intermolecular interactions, dictated by crystal packing, are key to controlling emission characteristics.
  • The study provides insights into designing organic materials with tailored optical properties.