Nondipolar structures with threefold symmetry for nonlinear optics

Rüdiger Wortmann, Christoph Glania, Peter Krämer, Ralf Matschiner, Jens Wolff, Stefan Kraft, Björn Treptow, Eugen Barbu, Daniela Längle, Gunter Görlitz

Research output: Contribution to journalArticlepeer-review


The second-order polarizabilities β(-2ω;ω,ω) of six nondipolar NLO chromophores - 1,3,5-tris(isopropyl-amino)-2,4,6-trinitrobenzene (1), 1,3,5-tris(isopropylamino)-2,4,6-tris(trifluoromethylsulfonyl)benzene (2), tris(dimethylimoniomethyl)methide diperchlorate (3), 2,4,6-tris[4-(N,N-diethylamino)phenyl ethynyl]-1,3,5-triazine (4), 2.4.6-tris[4-(N,N-diethylamino)phenyl]- 1,3,5-triazine (5), and tris(2-dimethylaminoethenyl)- methinium perchlorate (6) - were studied by polarized hyper-Rayleigh scattering (HRS). The NLO activity of these two-dimensional NLO chromophores is attributed to three-level contributions to the β values, for which different optimization strategies are investigated. Exceptionally large second-order polarizabilities were observed for the conjugationally elongated structures: the β value of triazine 4 is 15 times larger than that of the one-dimensional two-level chromophore 4-nitroaniline. Results obtained with the polarized HRS experiment are discussed with respect to local field corrections, calibration, and systematic sources of error.

Original languageEnglish
Pages (from-to)1765-1773
Number of pages9
JournalChemistry - A European Journal
Issue number11
Publication statusPublished - 1 Jan 1997


  • Cyanines
  • Hyper-Rayleigh scattering
  • Nonlinear optics
  • Second-order polarizability
  • Triazines


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