Two new copper thiostannates synthesised under solvothermal conditions: Crystal structures, spectroscopic and thermal properties of (DBUH)CuSnS 3 and (1,4-dabH 2)Cu 2SnS 4

Abstract

The new compounds (DBUH)CuSnS 3 ( 1) (DBU = 1,8-diazabicyclo[5.4.0]undec-7-ene) and (1,4-dabH 2)Cu 2SnS 4 ( 2) (1,4-dab = 1,4-diaminobutane) were prepared under solvothermal conditions. In compound 1 two SnS 4 tetrahedra share common edges yielding an Sn 2S 6 moiety. Unusual nearly linear CuS 2 dumbbells interconnect the Sn 2S 6 groups forming an one-dimensional [CuSnS 3] − chain. Every anionic chain is surrounded by mono-protonated organic cations. In compound 2 SnS 4 tetrahedra are joined by CuS 3 triangles to form an one-dimensional anionic [Cu 2SnS 4] 2− chain. Central motifs of the chain are distorted Cu 4S 4 and Cu 2Sn 2S 4 cubes sharing common faces. Four edges of the former cube are capped by two Sn and two S atoms whereas the latter cube is capped by two Cu and two S atoms. An alternative description is based on the interconnection of two Cu 4 tetrahedra by two S atoms to form a Cu 8S 2 unit. This unit is then joined in an alternating way by two SnS 4 tetrahedra yielding the anionic chains. Both compounds were characterised by UV/Vis and Raman spectroscopies as well as thermoanalysis.