US 5,374,734 A · Monohydrogentartrate crystalline structure having nonlinear quadratic effects

Abstract

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.

Claims2

Dependent claims

A crystalline structure exhibiting nonlinear quadratic effects and a wide transparency range extending from the visible to the near infrared, consisting of 2-amino-5-nitropyridinium cations combined with polyanionic organic matrix of left-handed or right-handed monohydrogentartrate anions;

wherein the cation corresponds to the following formula:
##STR2## in which:
R represents a hydrogen atom, a methyl or ethyl radical or a hydroxyl radical.

Dependencies are inferred from the claim text.

Monohydrogentartrate crystalline structure having nonlinear quadratic effects

Life of this patent

Monohydrogentartrate crystalline structure having nonlinear quadratic effects

Life of this patent

Abstract

Claims2