Darstellung und Kristallstruktur von Cs₂Sn₃Se₇, ein Cäsium-selenostannat(IV) mit fünffach koordiniertem Zinn / Preparation and Crystal Structure of Cs₂Sn₃Se₇, a Cesium Selenostannate(IV) with Pentacoordinated Tin

Abstract

Methanolothermal reaction of Cs2CO3 with SnSe, in the presence of SnSe at 160 C and 13 bar yields the selenostannates(IV) Cs4Sn2Se6 and Cs,Sn3Se7. The structure of the latter phase was established by X-ray structural analysis. The crystal structure contains polyselenostannate(IV) sheet anions [Sn3Se72-]∞2, for which the basic elements are trigonal SnSe5-bipyramids. Six of the seven independent selenium atoms in the asymmetric unit are coordinated by two tin atoms, one by three atoms. Neighbouring anion sheets are so placed that channels are formed which contain two independent cesium cations; these display coordination numbers of, respectively, eight and seven.

Trimethylammonium Tin Sulfide

“…This substance was synthesized hydrothermally from slurries of SnS2, tetramethylammonium hydroxide (TMA-OH), elemental S and H20. It has a framework similar to that described by Sheldrick & Braunbeck (1990) for the alkali metal selenide analogue CS2Sn3SeT. Here, we report a closely related compound obtained after prolonged heating of the same organic template (TMA-OH) but with different Sn and S reactants.…”

Varied forms of lamellar [Sn3Se7]n2n−anion: the competitive and synergistic structure-directing effects of metal–amine complex and imidazolium cations

“…[1][2][3][4][5][6] In the synthesis of chalcogenidometallates, organic amines or alkali metal cations have typically been chosen as templates or structure-directing agents (SDA). 3,[7][8][9][10][11][12][13] Recently, metal-amine complexes (MACs) have also been found to be effective SDA in directing chalcogenidometallates. [14][15][16][17][18] On the other hand, the excellent solvating properties and structure-directing effects of ionic liquids (ILs) have made them promising media in inorganic synthesis.…”

“…S1, ESI †). 10 ] units into a six-membered ring leads to eightmembered heart-shaped rings in 3 and mixed six-and eightmembered rings in 4, respectively. To the best of our knowledge, such a novel eight-membered heart-shaped ring of [Sn 3 Se 7 ] n 2n− structure has never been reported before.…”

Synthesis and Structure of [Sn4Se11]6-,1∞ [Sn2Se52-], and1∞ [Sn3Se72-] - Model Anions for the Solventothermal Reaction Pathway to Lamellar Selenidostannates(IV)

“…The first discussion of the technological potential of 2-and 3-dimensional polymeric thio-and selenidometalates(IV) of the heavier Group 14 elements Ge and Sn as zeotype materials appeared in an article by Bedard et al in 1989 [6]. Recent employment of a range of alkylammonium cations to direct the construction of lamellar thiostannates(IV) under mild hydrothermal conditions has underlined the decisive role of space-filling and chargecompensation effects during the required self-assembly process [5,7] 2 rings, in which the participating tin atoms exhibit a trigonal bipyramidal coordination geometry. Selenidostannates(IV) of similar formula type (e. g. Cs 3 Sn 3 Se 7 [1]) contain an analogous lamellar anionic network (Fig.…”

“…Their results indicate that whereas temperature is the primary factor in determining whether crystalline products are obtained, pH and starting materials are of importance in controlling the rate of reaction and the polytypic structure formed. Evidence was provided that the construction of (Me 4 N) 2 ] chains as characteristic structural motifs but not Sn 3 Se 4 ªsemicubesº, led us to propose a very different reaction pathway for this class of 2-dimensional chalcogenidostannates(IV). We suggested that, after initial corner condensation of [Sn 2 E 6 ] 4± ditetrahedra to tetrameric species [Sn 4 E 11 ] 4± , repeated corner-sharing could afford oligomers and finally infinite 1 ∞ [Sn 2 E 5 2± ] chains, whose further mode of condensation to porous sheets will depend on the size and shape of the structure-directing cation.…”