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Charge-transfer complexes of some linear conjugated polyenes

B Mallik, K M Jain, T N Misra

    The Biochemical Journal
    |September 1, 1980
    PubMed
    Summary

    Electron acceptor molecules form charge-transfer complexes with polyenes like beta-carotene. This interaction reveals insights into the electronic properties of these natural pigments.

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    Fitoterapia·2001

    Area of Science:

    • Photochemistry
    • Organic Electronics
    • Spectroscopy

    Background:

    • Carotenoids, including all-trans-beta-carotene, beta-apo-8'-carotenal, astacene, and methylbixin, are natural pigments with potential electronic applications.
    • Understanding their interaction with electron acceptors is crucial for developing novel organic electronic materials.

    Purpose of the Study:

    • To investigate the adsorption of electron acceptor molecules on solid films of various polyenes.
    • To characterize the electronic interactions and complex formation between polyenes and acceptors.
    • To determine the ionization potentials of the studied polyenes using spectroscopic methods.

    Main Methods:

    • Adsorption of electron acceptor molecules onto solid films of all-trans-beta-carotene, beta-apo-8'-carotenal, astacene, and methylbixin.
    • UV-Vis absorption spectroscopy to monitor spectral changes and identify new absorption bands.
    • Analysis of the relationship between the new band's position and the electron affinity of acceptor molecules.

    Main Results:

    • A new absorption band appeared on the longer-wavelength side of the spectrum upon adsorption of electron acceptors.
    • The position of this new band showed a linear dependence on the electron affinity of the acceptor molecules.
    • The intensity of the new band correlated with the amount of adsorbed acceptor molecules.

    Conclusions:

    • The studied polyenes act as electron donors, forming molecular charge-transfer complexes with electron acceptors.
    • These complexes can further dissociate into ionic complexes.
    • The observed linear relationship allowed for the estimation of polyene ionization potentials, consistent with other methods.

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