DIPOLE MOMENTS OF THE LOWEST SINGLET $\pi^{\ast}\leftarrow \pi$ STATES IN p-FLUOROANILINE AND p-FLUOROPHENOL.

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1969

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Ohio State University

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The Stark effect within the rotational fine structure is used to measure the change in dipole moment on excitation of p-fluoroaniline and p-fluorophenol. The spectra are observed in the 0-0 bands of the lowest lying singlet $\pi^{\ast}\leftarrow \pi$ transitions. The results are $|\Delta \mu| = 0.44 \pm 0.10 D$ for p-fluorophenol and $|\Delta \mu| = 0.82 \pm 0.09 D$ for p-fluoroaniline. If the sign of the change is taken to be positive, the results correlate well with the observed structural changes on excitation. This correlation indicates the extent of quinoid-like resonance structure to the electronic nature of the excited state.

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Author Institution: Department of Chemistry, University of Illinois

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