Two New Layered Thioantimonate(III) Compounds: Solvothermal Syntheses, Crystal Structures, and Properties of (trans-1,4-C6N2H15)Sb3S5 and (trans-1,2-C6N2H15)Sb3S5·H2O

Abstract

Two new thioantimonate(III) compounds (trans-1,4-chxnH)Sb3S5 (I) and (trans-1,2-chxnH)Sb3S5·H2O (II) (chxn = diaminocyclohexane = C6N2H14) were prepared under solvothermal conditions. Structure-directing arrangements of the organic molecules are formed under the conditions of synthesis; these consist of hydrogen-bonded chains (I) and of double chains of the amine molecules indirectly joined by water molecules through hydrogen bonding (II). In both compounds the structure-directing counter-ions are arranged in a layer-like fashion and because of the similar arrangements the topologies of the thioantimonate(III) layers 2∞[Sb3S5]− are nearly identical. The anionic layers are formed by interconnection of SbS3 trigonal pyramids and SbS4 moieties. The layers containing Sb2S2, Sb4S4, and Sb10S10 heterorings as secondary building units are stacked parallel to the b axis. The anionic layers and the structure-directing aggregates are stacked in a sandwich-like fashion. The water molecule in II can be removed at low temperatures, and this process is partially reversible. Interestingly, the removal of water is accompanied by a pronounced colour change from bright yellow to red. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)