Synthesis, Crystal Structure, and Optical Properties of a Three-Dimensional Quaternary Hg–In–S–Cl Chalcohalide: Hg₇InS₆Cl₅

A crystalline three-dimensional (3D) quaternary chalcohalide, Hg₇InS₆Cl₅ (<b>1</b>), has been synthesized through a solid-state reaction under medium temperature. It is the first example in the family of the Hg–IIIA–Q–X (Q = S, Se, Te; X = F, Cl, Br, I) systems. Compound <b>1</b> features a 3D network and has an optical band gap of 2.54 eV