Nondipolar structures with threefold symmetry for nonlinear optics

被引：93

作者：

Wortmann, R ^{[1
]}

Glania, C ^{[1
]}

Kramer, P ^{[1
]}

Matschiner, R ^{[1
]}

Wolff, JJ ^{[1
]}

Kraft, S ^{[1
]}

Treptow, B ^{[1
]}

Barbu, E ^{[1
]}

Langle, D ^{[1
]}

Gorlitz, G ^{[1
]}

机构：

[1] UNIV HEIDELBERG,INST ORGAN CHEM,D-69120 HEIDELBERG,GERMANY

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 1997年 / 3卷 / 11期

关键词：

cyanines; hyper-Rayleigh scattering; nonlinear optics; second-order polarizability; triazines;

D O I：

10.1002/chem.19970031107

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The second-order polarizabilities beta(-2 omega;omega,omega) of six nondipolar NLO chromophores-1,3,5-tris(isopropylamino)-2,4,6-trinitrobenzene (1), 1,3,5-tris(isopropylamino)-2,4,6-tris(trifluoro methylsulfonyl)benzene (2), tris(dimethylimoniomethyl)methide diperchlorate (3), 2,4,6-tris[4-(N,N-diethylamino)phenylethynyl]-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 beta values, for which different optimization strategies are investigated. Exceptionally large second-order polarizabilities were observed for the conjugationally elongated structures: the beta 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.

引用

页码：1765 / 1773

页数：9

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