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Nondipolar Structures With Threefold Symmetry For Nonlinear Optics
Author(s) -
Wortmann Rüdiger,
Glania Christoph,
Krämer Peter,
Matschiner Ralf,
Jens Wolff J.,
Kraft Stefan,
Treptow Björn,
Barbu Eugen,
Längle Daniela,
Görlitz Gunter
Publication year - 1997
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.19970031107
Subject(s) - chromophore , tris , chemistry , rayleigh scattering , perchlorate , scattering , isopropyl , analytical chemistry (journal) , photochemistry , physics , optics , organic chemistry , ion , biochemistry
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(trifluoro‐methylsulfonyl)benzene ( 2 ), tris(dimethyl‐imoniomethyl)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.