【无机化学学报】doi: 10.11862/CJIC.20240045
Two alkali-metal sulfamates nonlinear optical (NLO) crystals, Li(NH2SO3) and Na(NH2SO3), have been obtained through the facile evaporation method. Li(NH2SO3) crystallizes in the polar space group Pca21 (No.29). The structure of Li(NH2SO3) can be described as a 3D network formed by [LiO4]7- polyhedral connecting with NH2SO3- tetrahedra through corner-sharing. Na(NH2SO3) crystallizes in the polar space group P212121 (No.19). The structure of Na(NH2SO3) can be described as a 3D network formed by distorted [NaO6]11- octahedral connecting with NH2SO3- tetrahedra through corner-sharing. The UV-Vis-near-infrared spectra demonstrate that Li(NH2SO3) and Na(NH2SO3) possessed large optical band gaps of 5.25 and 4.81 eV, respectively. Powder second-harmonic generation (SHG) measurements demonstrate that the SHG intensity of Li(NH2SO3) and Na(NH2SO3) were 0.32 times and 0.31 times that of KH2PO4, respectively. First-principles calculations confirm the nonlinear optical performance mainly derived from the synergistic effect of amino sulfonate anions and alkali metal oxide anionic polyhedra.