Selenidostannates and a Silver Selenidostannate Synthesized in Deep Eutectic Solvents: Crystal Structures and Thermochromic Study.Deep eutectic solvents (DESs) have been adopted as reaction media for solvothermal synthesis of crystal materials.  Compound 4 exhibits a marked thermochromic performance in the visible light range owing to the negative temperature dependence of its band gap ( Eg = 2.305-2.119 eV in the range of 100-450 K). 
THERM