1965 Volume 38 Issue 12 Pages 2110-2114
The frequency of the charge-transfer absorption of the PMDA complex has been found to be linearly dependent on the energy level of the highest-occupied MO of the aromatic donor as estimated by the Hiickel MO method. The behavior of the complex in the solid state is almost parallel to that in a solution. On the basis of these linear relationships, it has been suggested that PMDA in ethyl acetate behaves as if it is an electron acceptor weaker than that in a solid complex and chloranil in carbon tetrachloride by about 0.2 eV. and 0.53 eV. respectively in the zero order approximation.
Another suggestion has been made that trans-stilbene may be slightly twisted around its essential single bond in a solution but not in the solid complex.
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