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1999 (1)
1998 (1)
1Author    Frank Wendland, Christian Näther, Michael Schur, Wolfgang BenschRequires cookie*
 Title    Solvothermal Synthesis and Crystal Structure Determination of Tris- (ethyleneamine-ammonium) Tetraselenoantimonat: Non-Centrosymmetry Mediated by an Extended Unusual N-H***N Hydrogen Bonded Network?  
 Abstract    The title compound has been synthesized under solvothermal conditions by the reaction of elemental chromium, antimony and selenium in a solution of 40% 1,2-ethanediamine (en) in methanol. The crystal structure consists of tetrahedral SbSe,*3 --anions which are connected by monoprotonated 1,2-ethanediamine (enH+) cations via N-H--Se hydrogen bonding. The enH+ cations are joined via strong N-H -N hydrogen bonds between the ammonium hydrogen and the amino nitrogen atom forming four distinct chains, each built up of three crystallographically independent enH+ cations. Two of these chains are running parallel to [100], the other two are parallel to [010]. Based on this arrangement different centrosymmetric or non-centrosymmetric hydrogen bonding patterns are possible, but only in one chain the sequence of NH2 and NH3+ groups was determined by X-ray diffraction. 
  Reference    Z. Naturforsch. 53b, 1144—1148 (1998); received June 15 1998 
  Published    1998 
  Keywords    Selenoantimonates, Solvothermal Synthesis, Crystal Structure, Hydrogen Bonding 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1144.pdf 
 Identifier    ZNB-1998-53b-1144 
 Volume    53 
2Author    Michael Schur, Astrid Gruhl, Christian Näther, Inke Jeß, Wolfgang BenschRequires cookie*
 Title    (CH3NH3)2Sb2S4, a New Thioantimonate(III) with Building Groups Stabilized by Hydrogen Bonds  
 Abstract    (CH3NH3)2Sb2S4 has been isolated from the reaction of antimony with sulfur in the presence of manganese in an ethanolic solution of methylamine under solvothermal conditions. Two pyramidal SbS? units are linked via common S-S edges to give dimeric Sb2S42-anions, which are joined via secondary Sb --S contacts of 3.074(2) and 2.975(2) A forming infinite 1 [SbS2]-^n chains consisting of edge-linked xp-SbS4 trigonal bipyramids. The cis configuration o? the Sb2S42-anions in the title compound is observed for the first time. A specific hydrogen-bonding pattern between the amino-hydrogen and the sulfur atoms stabilizes this configuration and gives rise to anionic layers separated by the methyl groups. 
  Reference    Z. Naturforsch. 54b, 1524—1528 (1999); received July 21 1999 
  Published    1999 
  Keywords    Thioantimonates, Solvothermal Synthesis, Crystal Structure, Hydrogen Bonding, Polymerie Anions 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1524.pdf 
 Identifier    ZNB-1999-54b-1524 
 Volume    54