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1Author    Z. NaturforschRequires cookie*
 Title    Kristallstruktur von MgS03*H20  
 Abstract    The crystal structure of M g S 0 3 H20 , space group P 2 \ln, Z = 4, Dx = 2.415 g em -3 , a = 4.699(1), b = 12.751(3), c = 5.618(1) Ä, ß = 90.49(3)°, was determined by single crystal X-ray diffraction. M g S 0 3 H20 crystallizes in the M n S 0 3 H20 type. The structure consists of buckled trans layers ^ [M gS03 H20 ], which are built up from strongly distorted M g 0 5(H20) octahedra sharing four equatorial vertices, and of trigonal pyramidal S 0 32-ions. It is close­ ly related to the structures of orthorhombic M nSe0s3 D 20 and monoclinic Z n S e 0 3 H20 . The M g -0 distances range from 2.051(3) to 2.175(4) A. The S-O distances (1.543(3), 1.547(3) and 1.493(3) Ä) and the O-S-O angles (98.4(2) and 2x 106.0(2)°) correspond to those in M n S 0 3 H20 . The distortion of the M 0 5(H20) octahedra (M = Mg, Mn) and of the S 0 32-ions is smaller in M g S 0 3 H20 , but with greater deviations from m symmetry. The distances between the H-connected ^ [M S 03 H20 ] layers are greater in M g S 0 3 H 20 , indicating weaker inter-layer hydrogen bonds. The lateral arrangement of the 2 [M S 0 3 H20 ] layers is nearly the same in both sulfite monohydrates. E in le itu n g 
  Reference    Z. Naturforsch. 53b, 131—134 (1998); eingegangen am 10. November 1997 
  Published    1998 
  Keywords    X-Ray, Sulfites, Hydrates, Magnesium, Pseudosymmetry 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0131.pdf 
 Identifier    ZNB-1998-53b-0131 
 Volume    53 
2Author    Antje Albert, Dietrich MootzRequires cookie*
 Title    8-Krone-6 und kleine Carbonsäuren. Bildung und Struktur binärer Addukte mit Ameisen-und Essigsäure sowie ternärer mit Essigsäure und Wasser 18-Crown-6 and Small Carboxylic Acids. Formation and Structure of Binary Adducts with Formic and Acetic Acid, as well as Ternary Ones with Acetic Acid and Water  
 Abstract    The melting diagrams of the binary systems 18-crown-6/formic acid and 18-crown-6/acetic acid have been set up and the crystal structures of the adducts 18C6 • 2 HCOOH (1, space group P 2 !/c with Z = 2 formula units per unit cell) and 18C6 • 2 CH 3COOH (2, C2/m, Z = 2) determined. Furthermore three ternary phases, 18C6 • CH3COOH • H20 (3, P2!/c, Z = 4) and dimorphic 18C6 • 2 C H 3COOH • 4 H 20 (high temperature form 4, P2,/n, Z = 2; low temperature form 5, P2|/n, Z = 2) have been characterized in the same way. In each structure the crown ether molecule has the (pseudo) D3d conformation common for many of its complexes. Various aspects of the intermolecular hydrogen bonding are described. 
  Reference    Z. Naturforsch. 53b, 242—248 (1998); eingegangen am 29. Oktober 1997 
  Published    1998 
  Keywords    Acetic Acid, Crown Ether, Formic Acid, Hydrate, Melting Diagram 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0242.pdf 
 Identifier    ZNB-1998-53b-0242 
 Volume    53 
3Author    Stephanie Janeda, Dietrich Mootz, HerrnRequires 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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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1197.pdf 
 Identifier    ZNB-1998-53b-1197 
 Volume    53