Ionic liquids (IL) are valuable in a variety of applications due to their high electrochemical stability and physical properties. Using the cation 1-methyl-3-octylimidazolium, [OMIM] + , the bromidostannate RTIL [OMIM][Sn +II Br 3 ], "undercooled melt" [OMIM][Sn +IV Br 5 ], and IL [OMIM] 2 [Sn +IV Br 6 ] were synthesized. The uncommon solid state structure of [SnBr 5 ] − was elucidated in the form of its RTIL salt. Additionally, the IL based on tribromine-monoanion [OMIM][Br 3 ] was used to dissolve metallic Sn, selectively resulting in the formation of [SnBr 3 ] − as confirmed by Raman spectroscopy. Subsequent cyclic voltammograms (CV) of [SnBr 3 ] − confirmed the deposition potential of metallic Sn and renewal of the polybromide [Br 3 ] − . The RTIL bromidostannates were stable compounds, making a selective electrochemical investigation of the deposition of metallic Sn(0) to Sn(+II)/Sn(+IV) redox process possible, via conductance and CV measurements. The CVs of the RTILs and of solutions in propylene carbonate had the redox couples of Sn(0)/