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

摘要

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.