The Lithium Iodostannate LiSn 3 I 7 : Synthesis, Properties and its Relationship to SnI 2

The mixed lithium tin iodide LiSn3I7 was prepared by reacting LiI and SnI2 at 300 °C. Single-crystal X-ray diffraction revealed a crystal structure related to that of SnI2, with nearly identical coordination environments atoms. ion in the shares one crystallographic position atom octahedral voids (LiSn)Sn2I7, as confirmed solid-state 7Li, 119Sn 127I MAS NMR spectra. DFT band calculations show be semiconductor an indirect bandgap on order 2 eV.