Two new quaternary selenostannates synthesized under solvothermal conditions: Crystal structure and reflectance spectra of (1,4-dabH)2MnSnSe4 and (1,4-dabH2) Cu2SnSe4

Two new quaternary selenostannates (1,4-dabH)2MnSnSe4 (1) (1,4-dab = 1,4-diaminobutane) and (1,4-dabH2) Cu2SnSe4 (2) were prepared under solvothermal conditions. Compound 1 consists of one-dimensional straight anionic chains composed of alternating SnSe4 and MnSe4 tetrahedra sharing common edges. The chains are directed along [001] and surrounded by the organic cations. In compound 2 SnSe4 tetrahedra are joined by CuSe3 triangles to form a one-dimensional anionic [Cu2SnSe4]2 − chain. The central motifs of the chain are distorted Cu4Se4 and Cu2Sn2Se4 cubes sharing common faces. Four edges of the former cube are capped by two Sn and two Se atoms whereas the latter cube is capped by two Cu and two Se atoms. Both compounds were characterized by UV/Vis and IR spectroscopies as well as elemental analysis.