Mild Solvothermal Syntheses and Characterization of Layered Copper Thioantimonates(III) and Thioarsenate(III)

The new copper thioantimonates­(III)
and thioarsenate­(III) Rb2Cu2Sb2S5 (1), Cs2Cu2Sb2S5 (2), and Rb8Cu6As8S19 (3) have been synthesized solvothermally.
Compound 1 contains a [Cu2SbS3]
net to which [Sb2S4] chains adhere through Cu–S
bonds and Sb–Cu interactions to give a layered structure. In
compound 2, the layer is formed by edge-sharing tetrahedral
CuS4 chains linked by dimeric [Sb2S5] units. The layered structure in compound 3 is constructed
by helical chains built from [Cu3S7] moieties
and dimeric [As2S5] units which are further
connected by tetrameric [As4S9] groups. Their
optical and thermal properties have been investigated.

本研究通过溶剂热法合成了三种新型硫代锑(III)酸铜与硫代砷(III)酸铜类化合物：Rb₂Cu₂Sb₂S₅（编号1）、Cs₂Cu₂Sb₂S₅（编号2）以及Rb₈Cu₆As₈S₁₉（编号3）。化合物1具有[Cu₂SbS₃]骨架，[Sb₂S₄]链通过Cu-S键与Sb-Cu相互作用附着于该骨架之上，最终形成层状结构。化合物2的层状结构由共边四面体CuS₄链构成，该链通过二聚体[Sb₂S₅]单元相互连接。化合物3的层状结构则由[Cu₃S₇]结构单元与二聚体[As₂S₅]单元构建的螺旋链构成，该螺旋链进一步通过四聚体[As₄S₉]基团实现连接。本研究还对这三种化合物的光学与热学性能开展了表征与分析。