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Absorption spectroscopic study of EDA complexes of.

S Bhattacharya1, S K Nayak, S K Chattopadhyay

  • 1Department of Chemistry, The University of Burdwan, Golapbag, India.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|February 24, 2001
PubMed
Summary

Fullerene (C70) forms 1:1 molecular complexes with various methylbenzenes in carbon tetrachloride. The formation constants (Kc) were determined, confirming a single stoichiometry for these fullerene-aromatic interactions.

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Area of Science:

  • Supramolecular Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Fullerenes are unique carbon allotropes with significant potential in materials science.
  • Understanding fullerene interactions with aromatic molecules is crucial for developing new functional materials.
  • Methylbenzenes (alkylbenzenes) are common aromatic compounds that can interact with fullerenes.

Purpose of the Study:

  • To investigate the formation of molecular complexes between fullerene (C70) and several methylbenzenes.
  • To determine the stoichiometry and formation constants of these complexes.
  • To elucidate the nature of the interaction between C70 and methylbenzenes in solution.

Main Methods:

  • Absorption spectroscopy was employed to study the interactions in carbon tetrachloride (CCl4) medium.

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  • Complex formation was monitored by observing changes in the absorption spectra of C70 upon addition of methylbenzenes.
  • Formation constants (Kc) were calculated based on spectral changes at different wavelengths.

    • Main Results:

    • Fullerene (C70) formed 1:1 molecular complexes with toluene, p-xylene, m-xylene, durene, and pentamethyl benzene (PMB).
    • Isosbestic points were observed for C70-PMB and C70-durene complexes, indicating a single equilibrium.
    • The intensity of the C70 absorption band decreased with increasing methylbenzene concentration, allowing for Kc determination.

    Conclusions:

    • The study confirms the formation of 1:1 complexes between C70 and the studied methylbenzenes.
    • The determined formation constants provide quantitative data on the strength of these fullerene-aromatic interactions.
    • The results support a single stoichiometry interaction, likely driven by non-covalent forces.