Extrapolation method for determination of extinction coefficients of free radical anions and di-anions in ether solution

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Abstract
An extrapolation method is described for the determination of the extinction coefficients of free radical anions and di-anions in ether solution. The method avoids the errors inherent in conventional methods and which could be considerable for those anions which must be handled in vacuo. It is applicable where, because of the equilibrium between radical anion and di-anion and generator, it is not possible experimentally to prepare a solution which comprises 100 % radical anion. Results for sodium benzophenone and sodium p-phenyl benzophenone in dioxan are given and discussed. The general applicability of the method is also discussed.

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