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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Chemical Sensing

Background:

  • Development of responsive materials for chemical detection.
  • Self-assembly of organic molecules into ordered structures.
  • Gelation phenomena driven by intermolecular forces.

Purpose of the Study:

  • To synthesize and characterize a novel 4-nitrobenzohydrazide derivative (C8).
  • To investigate the self-assembly behavior and gelation properties of C8.
  • To explore the potential of the synthesized gel for fluoride ion detection.

Main Methods:

  • Synthesis of N-(3,4,5-octyloxybenzoyl)-N'-(4'-nitrobenzoyl)hydrazine (C8).
  • Gelation studies in organic solvents.
  • Xerogel analysis using Wide-Angle X-ray Diffraction (WXRD).
  • Morphological characterization using Scanning Electron Microscopy (SEM).
  • Structural confirmation via Fourier-Transform Infrared (FT-IR) spectroscopy.
  • Fluoride ion sensing experiments.

Main Results:

  • C8 formed stable gels in selected organic solvents.
  • WXRD revealed a layered structure in xerogels.
  • SEM showed self-assembly into fibrous aggregates.
  • FT-IR confirmed hydrogen bonding as the driving force for self-assembly.
  • The gel exhibited a reversible gel-sol transition and a color change (colorless to red) upon fluoride ion addition.
  • An extended conjugated system and intramolecular hydrogen bonding were identified as key for the color change.

Conclusions:

  • The synthesized 4-nitrobenzohydrazide derivative (C8) effectively forms self-assembled gels.
  • The material demonstrates potential for naked-eye detection of fluoride ions via a colorimetric response.
  • The study highlights the role of molecular design in creating responsive supramolecular materials.