K2Na3[{B6O10(OH)}{B3O4(OH)3}] ⋅ H2O: A Layered Borate Built by Mixed Oxoboron Clusters with Nonlinear‐Optical Property

• Published in: Chemistry, an Asian journal an Asian journal, 2021-10, Vol.16 (20), p.3244-3248
• Main Authors: Chen, Chong‐An, Qiu, Qi‐Ming, Yang, Guo‐Yu
• Format: Article
• Language: English
• Subjects: Borate; Chemistry; Clusters; Harmonic generations; Layered structure; Mixed-oxoboron cluster; Nonlinear optics; Optical properties; Potassium phosphates; Solvothermal syntheses; Stability analysis; Thermal stability; Thermogravimetric analysis
• ISSN: 1861-4728; 1861-471X
• DOI: 10.1002/asia.202100869

A new acentric borate, K2Na3[{B6O10(OH)}‐{B3O4(OH)3}] ⋅ H2O (1) has been made under solvothermal condition. 1 has layered structure made by B6O13(OH)‐based chains and B3O5(OH)3‐bridging clusters. Second‐harmonic generation (SHG) measurements reveal that 1 is a phase‐matchable nonlinear optical (NLO) material, showing the SHG signal intensity of 1.8 times that of KDP (KH2PO4). Besides, UV‐Vis diffuse reflectance spectrum shows that 1 has the short deep UV (DUV) absorption cutoff edge of 198 nm. Thermogravimetric analysis reveals it has good thermal stability. Also 1 represents firstly mixed oxoboron clusters‐made 2D layered borate with NLO property. The first mixed oxoboron cluster‐made 2D layered borate with NLO property, K2Na3[{B6O10(OH)}{B3O4−(OH)3}] ⋅ H2O, has been solvothermally made. The layer is formed by B6O10(OH)‐based 1D chains and B3O5(OH)3 bridging clusters. It exhibits SHG response of 1.8 times that of KDP and the cutoff edge below 200 nm, indicating it's a potential DUV NLO material.