| | 1 | Author
| Frank Wendland, Christian Näther, Michael Schur, Wolfgang Bensch | Requires 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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| default:Reihe_B/53/ZNB-1998-53b-1144.pdf | | | | Identifier
| ZNB-1998-53b-1144 | | | | Volume
| 53 | |
| 2 | Author
| Stephanie Janeda, Dietrich Mootz, Herrn | Requires cookie* | | | Title
| Niedere Hydrate aliphatischer primärer Amine. Neue Untersuchungen zu Bildung und Struktur [1] Lower Hydrates of Aliphatic Primary Amines. New Studies of Formation and Structure [1] | | | | Abstract
| After earlier work in this laboratory on lower hydrates of amines, the melting diagram of the system 1 ,8-diaminooctane/water and six new crystal structures of hemi-and monohydrates of terminal primary n-alkylamines and diamines have been determined. In the hydrates 1 -PrNH2 • 0.5 H20 (space group C 2/m with Z = 4 formula units per unit cell), l-HexNH2 • 0.5 H20 (PI, Z = 2) and H2N(CH2)nNH2 • H20 with n = 4, 6, 8 (P 2x/c, Z = 4), the O and N atoms are hydrogen-bonded into a two-dimensional array analogous to the mutual coordination of cations and anions in the Cdl2 structure type: [ON6/3] ~ [CdI6/3]. In the hydrate H2N(CH2)2NH2 • H20 (C 2/c, Z = 4), the H20/N H 2 partial structure is three-dimensional but can be reduced, by neglecting the longest H bond, to an array which is again just two-dimensional and related now to the red Hgl2 structure type: [ON4y2] ~ [HgI4/2], In all the monohydrates, the arrays as defined are crosslinked by the alkylene cnains of the bifunctional amine molecules. | | | |
Reference
| Z. Naturforsch. 53b, 1197—1202 (1998); eingegangen am 22. Mai 1998 | | | |
Published
| 1998 | | | |
Keywords
| Amine Hydrates, Hydrates, Melting Diagram, Crystal Structure, Hydrogen Bonding | | | |
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| default:Reihe_B/53/ZNB-1998-53b-1197.pdf | | | | Identifier
| ZNB-1998-53b-1197 | | | | Volume
| 53 | |
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