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Dimensional Reduction of a Selenido Stannate Salt in Ionic Liquids to form 2D‐K 2 Sn 2 Se 5 , a Direct Heavy Analogue of an Oxo Silicate
Author(s) -
Peters Bertram,
Santner Silke,
Dehnen Stefanie
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202000162
Subject(s) - stannate , crystallography , ionic bonding , chemistry , tetrahedron , coordination number , tin , group (periodic table) , inorganic chemistry , stereochemistry , ion , zinc , organic chemistry
The structural motifs of SiO 2 or silicates, on one hand, and their heavier homologues of group 14 (T) and group 16 (E) elements, on the other hand, commonly differ, as the strict adherence to corner‐sharing is not necessary in the latter owing to larger interatomic distances. On the contrary: larger coordination numbers as well as edge‐sharing of the coordination polyhedra are preferred in [T x E y ] subunits with T = Si, Ge, Sn and E = S, Se, Te. Hence, we were surprised to find a new modification of the selenido stannate K 2 Sn 2 Se 5 , which is comprised of exclusively corner‐sharing [SnSe 4 ] tetrahedra in a layer‐type anionic substructure 2D‐{[Sn 2 Se 5 ] 2– }. While the structure of the title compound 2D‐K 2 Sn 2 Se 5 ( 1 ) differs significantly from the known parent compound, 3D‐K 2 Se 2 Se 5 , it shows similarities with layered silicates of the apophyllite family. To the best of our knowledge, 1 represents the first known selenido stannate with an oxo silicate‐like 2D structure. It formed besides known selenido stannes upon heating 3D‐K 2 Sn 2 Se 5 in in imidazolium‐based ionic liquids (C 2 C 2 Im)[BF 4 ] or (C 2 C 2 Im)[BF 4 ] in the presence of DMMP and Cd 2+ or Zn 2+ .