New thiostannates synthesized under solvothermal conditions: Crystal structures of (trenH)2Sn3S7 and {[Mn(tren)]2Sn2S6}

Abstract

The two new thiostannate compounds (trenH)2Sn3S 7 (1) and {[Mn(tren)]2Sn2S6} (2) (tren = tris-2-aminoethylamine) were obtained under solvothermal conditions. Compound 1 crystallizes in the hexagonal space group P63/mmc with a = 13.2642(19), c= 19.078(3) Å, V = 2906.9(7) Å3. The layered [Sn3S7]2- anion is constructed by Sn3S4 semi-cubes sharing common edges. The layers are characterized by large hexagonal pores with dimensions of about 11 × 11 Å2. Compound 2 crystallizes in the triclinic space group P1̄ with lattice parameters a = 7.6485(7), b = 8.1062(7), c= 12.1805(11) Å, α = 97.367(11), β = 103.995(11), γ= 108.762(10)°, V = 676.17(10) Å3. The [Sn2S6] 4- anion is composed of two edge-sharing SnS4 tetrahedra and joins two Mn2+-centered complexes by Mn-S bond formation. The Mn2+ cation is in a trigonal-bipyramidal environment of four N atoms of the tren ligand and one S atom of the thiostannate anion. Both compounds are semiconductors with a band gap of 2.96 eV for 1 and of 2.75 eV for 2. © 2012 Verlag der Zeitschrift für Naturforschung.