BING-2: a layered tin–oxalate potassium fluoride, KSn(C2O4)F

The title compound, KSn(C2O4)F, is a two-dimensional material related to our previously reported three-dimensional framework, Na4Sn4(C2O4)3F6. Both are alkali-metal tin–oxalate materials, but here the compound is layered and has potassium in place of sodium. The material was synthesized solvothermally at 423 K and crystallized in the monoclinic space group P21/c. The structure consists of potassium fluoride layers in the bc plane, which are sandwiched on both sides by tin–oxalate chains that extend along the c axis.