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Related Experiment Videos

Excited-State Intramolecular Proton Transfer-Based Multifunctional Solid-State Emitter: A Fluorescent Platform with

Pragyan Pallavi1, Virendra Kumar1, Md Waseem Hussain1

  • 1Indian Institute of Science Education and Research, Bhopal , Bhopal By-Pass Road , Bhauri, Bhopal 462066 , Madhya Pradesh , India.

ACS Applied Materials & Interfaces
|November 29, 2018
PubMed
Summary
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This study introduces a new molecular probe that overcomes weak solid-state emission issues common in excited-state intramolecular proton transfer (ESIPT) probes. The novel material exhibits enhanced fluorescence, enabling applications in sensors and rewritable displays.

Area of Science:

  • Materials Science
  • Photochemistry
  • Supramolecular Chemistry

Background:

  • Excited-state intramolecular proton transfer (ESIPT) probes are valuable for sensing due to environment-sensitive fluorescence.
  • A key limitation of ESIPT fluorophores is weak solid-state emission, hindering practical applications.
  • Developing solid-state emissive ESIPT materials is crucial for advanced sensors and switches.

Purpose of the Study:

  • To design and synthesize a novel C3 symmetric-like molecular architecture for enhanced solid-state fluorescence.
  • To investigate the photophysical properties and stimuli-responsive behavior of the new ESIPT material.
  • To explore the potential of the material in applications such as sensors, switches, and rewritable platforms.

Main Methods:

  • Schiff base condensation reaction between triaminoguanidinium chloride and 3,5-di-tert-butyl-2-hydroxybenzaldehyde.
Keywords:
ESIPTfluorescence switchingmolecular inkmultifunctionalsolid-state emissionthin film

Related Experiment Videos

  • Temperature-dependent fluorescence spectroscopy (including 77 K) to study tautomer emission.
  • Time-resolved fluorescence measurements to elucidate excited-state dynamics.
  • Exposure to acid/base vapor and Zn2+ ions to assess stimuli-responsive fluorescence.

    • Main Results:

    • The synthesized molecule (TGHB) exhibits significantly enhanced solid-state fluorescence (1600x quantum yield increase) compared to solution.
    • Facile ESIPT in the solid state restricts intramolecular rotation, suppressing non-radiative decay.
    • TGHB demonstrates reversible "turn on-off" fluorescence in response to acid/base vapor, enabling rewritable platforms.
    • Selective "turn-on" fluorescence response to Zn2+ ions was observed due to O and N donor sites.

    Conclusions:

    • The novel TGHB molecule overcomes the solid-state emission limitations of traditional ESIPT probes.
    • The material shows excellent potential for developing cost-effective, multifunctional stimuli-responsive molecular switches and sensors.
    • The structure-property relationship provides a foundation for designing advanced materials for real-time applications.