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.

将硫化氢(H₂S)有毒废气转化为氢气(H₂)和高附加值含硫化学品一直是光催化分解H₂S领域的重要研究目标。本文借助孪晶Mn_0.5Cd_0.5S (T-MCS)固溶体的结构优势促进光催化剂体相电荷分离，并将导电性能优异的二硫化镍(NiS₂)负载于T-MCS表面，构建了NiS₂/T-MCS界面肖特基结与体相S型孪晶同质结复合光催化剂。研究表明，NiS₂不仅引入了大量活性位点，而且显著改善了表面电荷分离效率。以0.1 mol L⁻¹ (M)硫化钠(Na₂S)与0.6 M无水亚硫酸钠(Na₂SO₃)吸收H₂S后的饱和溶液作为反应液，8 wt% NiS₂/T-MCS复合材料产氢速率可达59.95 mmol h⁻¹ g⁻¹。傅里叶变换红外光谱(FTIR)与紫外-可见吸收光谱(UV-Vis)证实反应液中硫化合物几乎完全转化为硫代硫酸钠(Na₂S₂O₃)，并通过滴定法对S₂O₃²⁻含量进行了定量测定。本文制备的肖特基结与固溶体孪晶同质结复合材料为开发高效H₂S光催化转化体系，以及同时获得H₂和Na₂S₂O₃提供了重要实验参考。