Influence of an External Electric Field on the Charge Transfer State of the TCNE-trans-Stilbene Molecular Complex

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Abstract
An experimental investigation of the effect of an external electric field on the absorptionspectrum of the tetracyanoethylene‐trans‐stilbene molecular complex in cyclohexane solution yielded values of 1.1±0.1 D for the ground stateelectric dipole moment and 10.5±0.9 D for the change of the electric dipole moment upon transition to the charge transferexcited state. The ground stateelectric dipole moment determined by the electro‐optic effect is in agreement with the value of 1.4±0.5 D obtained from the dielectric constantmeasurements made on solutions of the complex. The directions of the transition moment, the ground stateelectric dipole moment, and the excited stateelectric dipole moments were found to be parallel. These results give a 5% ionic character for the ground state of the complex and 76% ionic character of the excited state. These results are consistent with the theory of Mulliken.

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