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Na 6 [B 18 Se 17 ]: The First Selenoborato‐ closo ‐dodecaborate with a Polymeric Chain Anion
Author(s) -
Hammerschmidt A.,
Lindemann A.,
Köster C.,
Krebs B.
Publication year - 2001
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 - 10.1002/1521-3749(200109)627:9<2121::aid-zaac2121>3.0.co;2-6
Subject(s) - chemistry , monoclinic crystal system , alkali metal , polymer chemistry , crystallography , stereochemistry , crystal structure , organic chemistry
Systematic studies on selenoborates containing a B 12 cluster entity and alkali metal cations led to the new crystalline phase Na 6 [B 18 Se 17 ] which consists of a icosahedral B 12 cluster completely saturated with trigonal‐planar BSe 3 units and sodium counter‐ions. Neighbouring cluster entities are connected in one direction via exocyclic selenium atoms forming the infinite chain anion ([B 18 Se 16 Se 2/2 ] 6– ) ∞ . 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 6 [B 18 Se 17 ] crystallizes in the monoclinic space group C2/c (no. 15) with a = 18.005(4) Å, b = 16.549(3) Å, c = 11.245(2) Å, β = 91.35(3)° and Z = 4.