Solvothermal Syntheses, Characterization, and Properties of Five Quaternary Thioarsenates and Thioantimonates

Five new quaternary thioarsenates/thioantimonates KHgAsS3 (1), Rb3Ag9As4S12 (2), RbAg2SbS3 (3), Rb2HgSbS3(SH) (4), and Cs2HgSbS3(SH) (5) were successfully obtained by the solvothermal method via excess sulfur as a mineralizer. The five synthesized sulfides exhibit different dimensions, including one-dimensional (4, 5), two-dimensional (1, 3), and three-dimensional (2). In their anionic structures, the transition metal ions (Ag+/Hg2+) adopt different coordination modes (AgS3, AgS4, and HgS4), and there exist different rings (6-, 8-, and 10-membered rings). The results of the UV–vis diffuse reflection experiment and theoretical calculation show that all the compounds are semiconductors. The experiments display that compound 4 exhibits relatively obvious photocatalytic degradation effect of methylene blue (MB) and displays a certain photoelectric response signal.