Solid-state Synthesis and Crystal Structure of a Novel Quaternary Metal Chalcogenide

An unprecedented quaternary metal chalcogenide hg 3 Zn 2 S 4 I 2 (1) has been obtained by solid-state reaction and structurally characterised by X-ray diffraction. Compound 1 crystallises in the space group C222 1 of the orthorhombic system with four formula units in a cell: a = 12.571(4), b = 7.258(3), c = 10.742(4) Å, V = 980.1(6) Å 3 , Hg 3 I 2 S 4 Zn 2 , M r = 1114.55, D c = 7.553 g cm −3 , T = 123.15 K, F(000) = 1880 and R1/ wR2 = 0.0636/0.1658 for 542 observed reflections ( I > 2σ( I)) and 572 unique reflections. Compound 1 is characterised by a novel 3-D framework motif.