Theoretical study of the conjugation length effect on the electronic and second‐order nonlinear optical properties of amino–nitro diphenylacetylenes

C. Dehu*, J. L. Brédas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We presnet a theoretical study of the effect of the conjugation length on the electronic properties and second‐order molecular polarizabilities β in p‐amino‐p′‐nitrodiphenylacetylene molecules where the number of triple bonds in the conjugated segment varies from 1 to 4. The β values are calculated via an intermediate neglect of differential overlap/single configuration interaction (INDO/SCI) sum‐over‐states (SOS) approach. We test the convergence of the SOS method and the validity of the two‐state model to describe the β response. The results indicate that increasing the conjugation length results in a decrease of the charge transfer within the molecule. The two‐state model is shown to break down as the conjugated segment extends to four triple bonds; this is due to the appearance of several low‐lying nearly isoenergetic excited states that significantly contribute to the β response. The theoretical results are in excellent agreement with recent experimental data. © 1994 John Wiley & Sons, Inc.

Original languageEnglish (US)
Pages (from-to)89-96
Number of pages8
JournalInternational Journal of Quantum Chemistry
Volume52
Issue number1
DOIs
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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