Solvothermal synthesis of two new thioantimonates with transition-metal complexes [Co(dien)2]4[CoSb6S14] and [Co(dien)2]2[Sb4S9]

Two new thioantimonates [Co(dien)2]4[CoSb6S14] (1) and [Co(dien)2]2[Sb4S9] (2, dien = diethylenediamine) were solvothermally synthesized by the reactions of Co, Sb and S in dien at 160 °C. 1 is composed of heterometallic [CoSb6S14]8− anion built up from the connection of one [CoS4] tetrahedron and two [SbIII3S7] units sharing edges, while 2 contains 1-D mixed-valent thioantimonate anion [Sb4S94−]n constructed by the connection of the [SbIII3S7] units and the SbVS4 tetrahedra sharing corners. The optical properties of 1 and 2 have been investigated by UV–Vis spectra.