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1993 (1)
1Author    MichaelW. Iebcke, ClemensC., F. Reyhardt3, Jürgen Felsche3, G. Ünter EngelhardtbRequires cookie*
 Title    Clathrates with Three-Dimensional Host Structures of Hydrogen-Bonded Pentaborate |B50 6(0 H )4]~ Ions: Pentaborates with the Cations NMe4+, NEt4+, NPhMe3+ and pipH+ (pipH+ = Piperidinium) [1]  
 Abstract    X-ray structure analyses of crystalline [NMe4][B50 6(0 H)4] «H 20 with n ~ 0.25-0.50 (1), [NEt4][B50 6(0 H)4] (2), [NPhM e3][B50 6(0 H)4] (3), and [pipH][B50 6(0 H)4] (4) reveal that these materials are novel clathrates with closely related three-dimensional host structures built up of hydrogen-bonded oligomeric pentaborate [B50 6(0 H)4]~ ions. The organic cations and water molecules (in 1) occupy as guest species large straight channel-like voids of nearly rectangular cross-section. Com pound 1 crystallizes monoclinically with space group P2,/c (Z = 4); the com pounds 2, 3 and 4, which possess the same host-structure topology, crystallize triclinically with space group P i (Z = 2). "B-M AS N M R spectra allow the detection of small angular distortions in the pentaborate anions caused by the specific hydrogen bonding in the host frameworks. U pon heating the com pounds on a therm obalance in a dynamic inert gas atm os­ phere dehydration occurs at temperatures of 563 K (1), 543 K (2), 558 K (3) and 523 K (4) before degradation of the organic cations starts at tem peratures o f 633 K (1), 623 K (2), 623 K (3) and 613 K (4). 
  Reference    Z. Naturforsch. 48b, 978—985 (1993); received February 17 1993 
  Published    1993 
  Keywords    Pentaborate, Tetraalkylammonium, Piperidinium, Clathrate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0978.pdf 
 Identifier    ZNB-1993-48b-0978 
 Volume    48