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-dimethylimidazolium).　Four　selenidostannates,　namely,　2D-(Bmmim)3[Ni(en)3]2[Sn9Se21]Cl　(1,　en=ethylenediamine),　2D-(Bmmim)8[Ni2(teta)2(μ-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]n2n-　structure　comprising　distinct　eight-membered　ring　units,　whereas　3　features　a　MAC-decorated　anionic　[Ni(tepa)Sn12Se28]n6n-　layered　structure.　In　contrast　to　1-3,　compound　4　exhibits　a　3D　open　framework　of　anionic　[Sn4Se9]n2n-.　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.　MAC　it　happen:　Presented　is　a　study　of　the　synergistic　structure-directing　effect　of　metal-amine　complexes　(MACs)　with　different　chelating　polyamine　ligands　and　imidazolium-based　ionic　liquid　(IL)　cations.　For　the　first　time,　a　layered　selenidostannate　with　an　asymmetric　eight-membered　ring,　an　organic-decorated　layered　selenidostannate,　and　a　3D　selenidostannate　with　both　the　MAC　and　IL　cations　as　structure-directing　agents　and　counterions　are　obtained.　en=ethylenediamine,　teta=triethylenetetramine,　tepa=tetraethylenepentamine,　1,2-pda=1,2-diaminopropane.　©　2016　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim.