Ionothermal syntheses and optical property of chromium selenidostannates containing linear polyamine ligand
Abstract Ternary chromium selenidostannates [Cr(tepa)(OH)]2Sn2Se6*H2O (tepa tetraethylenepentamine) (1) and [Cr(peha)]2(Sn2Se6)Cl2 (peha pentaethylenehexamide) (2) were successfully synthesized by the reaction of CrCl3*6H2O, Sn, Se and tepa or peha in ionic liquid 1 ethyl 3 methylimidazolium chloride at 160 degC. In the ionic liquid, the Cr3 ion forms [Cr(tepa)(OH)]2 or [Cr(peha)]3 chelating complex cations, which lead to the formation of chromium selenidostannates 1 and 2. But the reactions in pure tepa or peha under solvothermal conditions produced amorphous powders. 1 and 2 are the first examples of TM complex contained chalcogenidostannates synthesized by ionothermal technique. Both 1 and 2 form three dimensional networks via intermolecular N HSe, O HSe and N HO or N HCl interactions, respectively. 1 and 2 exhibit possible semiconducting properties with the band gaps at 2.08 and 2.19 eV, respectively.