TY - JOUR
T1 - Nondipolar structures with threefold symmetry for nonlinear optics
AU - Wortmann, Rüdiger
AU - Glania, Christoph
AU - Krämer, Peter
AU - Matschiner, Ralf
AU - Wolff, Jens
AU - Kraft, Stefan
AU - Treptow, Björn
AU - Barbu, Eugen
AU - Längle, Daniela
AU - Görlitz, Gunter
PY - 1997/1/1
Y1 - 1997/1/1
N2 - 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.
AB - 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.
KW - Cyanines
KW - Hyper-Rayleigh scattering
KW - Nonlinear optics
KW - Second-order polarizability
KW - Triazines
UR - http://www.scopus.com/inward/record.url?scp=0030832655&partnerID=8YFLogxK
U2 - 10.1002/chem.19970031107
DO - 10.1002/chem.19970031107
M3 - Article
AN - SCOPUS:0030832655
SN - 0947-6539
VL - 3
SP - 1765
EP - 1773
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 11
ER -