Preparation of thermochromic selenidostannates in deep eutectic solvents

Abstract

Deep eutectic mixtures were deployed for the preparation of porous layered [Sn₃Se₇]_n²ⁿ⁻ single crystals. The perforation on the layers accentuates the negative temperature dependence of its band gap, resulting in remarkable thermochromic performance. Substitution of the hydroxo group by the methyl group provides an enhanced hydrophobicity for the organic template, leading to an anhydrous product with a remarkably improved thermal stability and thus reversible thermochromic properties.