Naphthalene dicarboxylic acid guanidine birefringent crystal as well as preparation method and application thereof
The π-conjugated organic acid guanidine salt birefringent optical crystal [C(NH2)3]2[C12H6O4]·4H2O was prepared by hydrothermal synthesis, which solved the problem of low birefringence value of existing birefringent materials and realized an optical crystal material with large birefringence, wide transmission range and high purity, which is suitable for the optical field.
Patent Information
- Application Number
- CN202511016106.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-23
- Publication Date
- 2025-10-17
AI Technical Summary
Existing birefringent materials such as MgF2, CaCO3, α-BaB2O4 and YVO4 have low birefringence values and insufficient optical modulation efficiency. Furthermore, YVO4 is expensive and energy-intensive to grow, which limits its application. Crystals containing tetrahedral groups, such as [C(NH2)3]3PO4·2H2O and C(NH2)3CH3SO3, have low birefringence, which hinders the application of birefringent crystals.
A π-conjugated organic acid guanidine salt birefringent optical crystal [C(NH2)3]2[C12H6O4]·4H2O was prepared by hydrothermal synthesis. The guanidine source and the 2,6-naphthalenedicarboxylic acid source were mixed in deionized water, and the reaction temperature was 80-300℃ for ≥24h to form a π-conjugated organic acid guanidine salt birefringent optical crystal with a monoclinic crystal system.
The prepared birefringent optical crystal has a large birefringence value of 0.434, a wide transmission range and an ultraviolet absorption cutoff wavelength of 350 nm, a band gap of 3.4 eV, is simple to operate, has high raw material utilization, high product purity, and is stable in air.