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Bridged Polysilsesquioxanes with Improved Second Order Nonlinear Optical Properties and Stability

Published online by Cambridge University Press:  10 February 2011

S. T. Hobson,
J. Zieba,
P. N. Prasad and
K. J. Shea
S. T. Hobson
Affiliation:
Drug Assessment Division, U. S. Army Med. Res. Inst. of Chem. Def., APG,MD, 21010-5405*
J. Zieba
Affiliation:
Department of Chemistry SUNY Buffalo, Buffalo, NY 14260-3000
P. N. Prasad
Affiliation:
Department of Chemistry SUNY Buffalo, Buffalo, NY 14260-3000
K. J. Shea
Affiliation:
Department of Chemistry University of California, Irvine, California, 92697-2025
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Abstract

We report the synthesis and sol-gel polymerization of 4-nitro-N,N-bis[(3- triethoxysilyl)propyl]aniline 1. An efficient synthesis of the monomer was developed by the hydrosilylation of N, N-diallyl-4-nitroaniline. Optical quality thin films were synthesized by spin coating an n-butanol solution of 1 using formic acid as catalyst and source of water. We improved the temporal stability of the NLO signal from films prepared from 4-nitro-N,N-bis[(3-triethoxysilyl)propyl]aniline by increasing the intensity of the poling field and extending the heating period during the poling/curing stage. By Maker fringe analysis, a X (2) value of 9 × 10−8 esu was measured for these polysilsesquioxanes. If one assumes that the major component of the NLO effect is along the z-axis, the X (2) value corresponds to a d33 coefficient of 18.9 pm/V and a r33 value of 4.7 pm/V.

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References

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