Centre National De La Recherche Scientifique

France Telecom

France Telecom Etablissement Autonome De Droit Public (Centre National

Rene Masse

Joseph Zyss

Jean-Pierre Levy

Rolland Hierle

Jacques Pecaut

Roland Hierle

The present invention relates to new noncentrosymmetric crystal structures consisting of an optionally substituted 2-amino-5-nitropyridinium halide. It also relates to a process for the preparation of these crystal structures. Finally, it relates to a device with an electro-optical effect comprising said crystal structure.

2-amino-5-nitropyridinium halide crystal structure and process for the

2-amino-5-nitropyridinium salts are provided which are usable in non-linear and electrooptics.

2-amino-5-nitropyridinium salts usable in non-linear optics and in

The present invention relates to new left-handed or right-handed monohydrogentartrate crystalline structures having nonlinear quadratic effects and a wide transparency range extending from the visible to the near infrared, consisting of optionally substituted 2-amino-5-nitropyridinium cations in combination with a polyanionic organic matrix formed of left-handed or right-handed monohydrogentartrate anions. It also relates to a process for the preparation of these crystalline structures consisting in mixing one mole of cation base with at least two moles of left-handed and/or right-handed tartaric acid. It finally relates to a device having an electrooptical effect containing said crystalline structure.

Monohydrogentartrate crystalline structure having nonlinear quadratic

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Brignoud, France

Rene Masse