Synthesizing 2D and 3D Selenidostannates in Ionic Liquids: The Synergistic Structure-Directing Effects of Ionic Liquids and Metal–Amine Complexes

Graphical 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. 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 [Sn 9 Se 21 ]Cl ( 1 , en=ethylenediamine), 2D-(Bmmim) 8 [Ni 2 (teta) 2 (μ-teta)]Sn 18 Se 42 ( 2 , teta=triethylenetetramine), 2D-(Bmmim) 4 [Ni(tepa)Cl] 2 [Ni(tepa)Sn 12 Se 28 ] ( 3 , tepa=tetraethylenepentamine), and 3D-(Bmmim) 2 [Ni(1,2-pda) 3 ]Sn 8 Se 18 ( 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 [Sn 3 Se 7 ] n 2 n − structure comprising distinct eight-membered ring units, whereas 3 features a MAC-decorated anionic [Ni(tepa)Sn 12 Se 28 ] n 6 n − layered structure. In contrast to 1 – 3 , compound 4 exhibits a 3D open framework of anionic [Sn 4 Se 9 ] n 2 n − . 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.