A Solvothermal Synthesis and the Structure of K₄Ag₂Sn₃S₉·2KOH

A novel layered K4Ag2Sn3S9·2KOH was synthesized solvothermally. A mixture of ethanol and HSCH2CH(SH)CH2OH was used for the synthesis. The HSCH2CH(SH)CH2OH plays an important role and appears to serve as a mineralizer for the solvothermal reaction. A layer comprises Sn3S96- clusters linked by Ag+ ions and possesses two types of 1D channels in which potassium ions are located. The compound crystallizes in the monoclinic P2(1)/m space group [a = 7.8071(2) Å, b = 27.3508(1) Å, c = 10.5008(2) Å, α = 90°, β = 103.874(1)°, γ = 90°, Z = 4]. Its crystal structure, composition analysis, and IR are presented.采用溶剂热法合成了一种新型层状化合物K₄Ag₂Sn₃S₉·2KOH。合成过程中使用了乙醇与HSCH₂CH(SH)CH₂OH的混合溶剂，该HSCH₂CH(SH)CH₂OH发挥了关键作用，可作为此溶剂热反应的矿化剂。该化合物的层结构由Ag⁺离子桥联的Sn₃S₉⁶⁻簇构成，层内存在两类可供钾离子占据的一维通道。该化合物属单斜晶系，空间群为P2₁/m，晶胞参数如下：a = 7.8071(2) Å，b = 27.3508(1) Å，c = 10.5008(2) Å，α = 90°，β = 103.874(1)°，γ = 90°，Z = 4。本文报道了该化合物的晶体结构、成分分析以及红外光谱（Infrared Spectroscopy，IR）表征结果。