Presented　are　the　ionothermal　syntheses,　characterizations,　and　properties　of　a　series　of　two-and　three-dimensional　selenidostannate　compounds　synergistically　directed　by　metal-amine　complex　(MAC)　cations　and　ionic　liquids　(ILs)　of　[Bmmim]Cl　(Bmmim　=　1-butyl-2,3-dimethyl-imidazolium).　Four　selenidostannates,　namely,　2D-(Bmmim)(3)[Ni(en)(3)](2)[Sn9Se21]Cl　(1,　en　=　ethylenediamine),　2D-(Bmmim)(8)[Ni-2(teta)(2)(mu-teta)]Sn18Se42　(2,　teta　=　triethylenetetramine),　2D-(Bmmim)(4)[Ni(tepa)Cl](2)[Ni(tepa)Sn12Se28]　(3,　tepa=　tetraethylenepentamine),　and　3D-(Bmmim)(2)[Ni(1,2-pda)(3)]Sn8Se18　(4,　1,2-pda　=　1,2-diaminopropane),　were　obtained.　Single-crystal　X-ray　diffraction　analyses　revealed　that　compounds　1　and　2　possess　a　lamellar　anionic　[Sn3Se7](n)(2n-)　structure　comprising　distinct　eight-membered　ring　units,　whereas　3　features　a　MAC-decorated　anionic　[Ni(tepa)Sn12Se28](n)(6n-)　layered　structure.　In　contrast　to　1-3,　compound　4　exhibits　a　3D　open　framework　of　anionic　[Sn4Se9](n)(2n-).　The　structural　variation　from　1　to　4　clearly　indicates　that　on　the　basis　of　the　synergistic　structure-directing　ability　of　the　MACs　and　ILs,　variation　of　the　organic　polyamine　ligand　has　a　significant　impact　on　the　formation　of　selenidostannates.