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Study Of The Influence Of The Nature And Position Of The Halogen Atom In The N-Halogenophenyl-2,5-dimethylpyrrole Upon The Vibrational (Hyper)polarizability: Theoretical Study

A. Saal, O. Ouamerali
Published 2003 · Chemistry

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The two contributions, vibrational and electronic, to the electrical properties polarizability and first hyperpolarizability of the N-[(2, 3, or 4)-fluorophenyl]-2,5-dimethylpyrrole are evaluated theoretically at the HF/6-31G level within the double harmonic oscillator approximation. The calculations demonstrate that, with the exception of the second harmonic generation, the vibrational contribution to the first hyperpolarizability is important. However, the vibrational polarizability, contributes at most, 10% to the total electric polarizability. The analysis upon the sum-over-states expressions shows that there are only few modes which contribute strongly and, generally, have small vibrational energies. The effect of the fluorine substitution by an other substituent is also addressed.
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