Ionothermal syntheses and optical property of chromium selenidostannates containing linear polyamine ligand

• Chromium selenidostannates 1 and 2 were firstly prepared using ionothermal methods.
• 1 and 2 are the first examples of ionothermally synthesized TM-chalcogenidostannates.
• The chromium selenidostannates exhibit optical band gaps of 2.08 and 2.19 eV.

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 °C. 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 NH⋯Se, OH⋯Se and NH⋯O or NH⋯Cl interactions, respectively. 1 and 2 exhibit possible semiconducting properties with the band gaps at 2.08 and 2.19 eV, respectively.

Chromium selenidostannates [Cr(tepa)(OH)]2Sn2Se6·H2O (1) and [Cr(peha)]2(Sn2Se6)Cl2 (2) were firstly prepared under ionothermal conditions. 1 and 2 are the first examples of ionothermally synthesized chalcogenidostannates containing TM-complexes.Figure optionsDownload as PowerPoint slide