Abstract
Two quaternary hetero-transition metal sulfides RbAg5HgS4 (1) and CsAgHgS2 (2) have been successfully synthesized under mild solvothermal method in the presence of thiophenol as a mineralizer. Compound 1 features an interesting 3-D [Ag5HgS4]- framework composed of 16-membered ring [Ag (2)4M(1)4S8] (M = Ag/Hg) and quasi-8-membered ring [Ag (2)4S4] which are all constructed by MS2 and AgS2 linear units. Compound 2 possesses anionic [AgHgS2]nn− layers formed with MS4 (M = Ag/Hg) tetrahedra, in which Ag+ and Hg2+ ions occupy the same crystallographic site. Particularly, this is the first time that quaternary A-Ag-Hg-S (A = alkali metal) system were explored via solvothermal method, which demonstrates that structural directing agents have significant influence on the structures of hetero-transition metal sulfides. Furthermore, the XRD experiment and band gap value of compound 2 were also investigated.
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