Absorption Spectra of Molecular Complexes

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IT has been shown by several workers1–4 that there is a rough correlation between the lowest ionization potential of an electron donor and the frequency of the maximum of the charge-transfer band (νCT) of lowest energy characteristic of the complex of the donor with a given acceptor. That the relation is not a very strict one is illustrated by Fig. 1, where such a plot is given for chloranil complexes in solution in carbon tetrachloride. The ionization potentials are those measured by Watanabe5 using a photo-ionization method.

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    McConnell, H., Ham, J. S., and Platt, J. R., J. Chem. Phys., 21, 66 (1058).

  2. 2

    Keefer, R. M., and Andrews, L. J., J. Amer. Chem. Soc., 74, 4500 (1952).

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    Briegleb, G., and Czekalla, J., Z. Electrochem., 59, 184 (1955).

  4. 4

    Bier, A., Rec. Trav. Chim., 75, 866 (1956).

  5. 5

    Watanabe, K., J. Phys. Chem., 22, 1564 (1954); 26, 542 (1957).

  6. 6

    de Maine, P. A. D., J. Phys. Chem., 26, 1189 (1957).

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FOSTER, R. Absorption Spectra of Molecular Complexes. Nature 181, 337–338 (1958) doi:10.1038/181337a0

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