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Na 2 [B 18 Se 16 ]: The First 3D Polymeric Selenoborato‐ closo ‐dodecaborate
Author(s) -
Hammerschmidt A.,
Döch M.,
Pütz S.,
Krebs B.
Publication year - 2005
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.200400521
Subject(s) - alkali metal , selenide , trigonal crystal system , crystallography , icosahedral symmetry , boron , cluster (spacecraft) , chemistry , selenium , sodium , ion , amorphous solid , crystal structure , organic chemistry , computer science , programming language
Systematic studies on selenoborates containing a B 12 cluster entity and alkali metal cations led to the new crystalline phase Na 2 [B 18 Se 16 ] which consists of a icosahedral B 12 cluster completely saturated with trigonal‐planar BSe 3 units and sodium counter‐ions. The cluster entities are connected to each other via seleno‐ and perselenobridges. Thus a three‐dimensional network results with [(B 18 Se 12 Se 6/2 ) n ] 2− ‐ and [(B 18 Se 15 Se 6/2 ) n ] 2− anions in a ratio of 2:1. The new chalcogenoborate was prepared in a solid state reaction from sodium selenide, amorphous boron and selenium in evacuated carbon coated silica tubes at a temperature of 850 °C. Na 2 [B 18 Se 16 ] crystallizes in the trigonal space group ${\rm P}{\bar 3}$ (no. 147) with a = 17.021(1) Å, c = 8.903(1) Å and Z = 3.