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1998[X]
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    M. Ichael Schmidt, Annette Schier, Hubert SchmidbaurRequires cookie*
 Title    Magnesium Bis[D(-)-Mandelate] Dihydrate and Other Alkaline Earth, Alkali, and Zinc Salts of Mandelic Acid  
 Abstract    , and zinc D(-)mandelates have been prepared from the parent mandelic acid and equivalent quantities (1:1 / 2:1) of the corresponding metal hydroxides in water. Colourless polycrystalline products are obtained from the aqueous solutions by evaporation of the solvent. The alkali, ammonium and strontium salts are anhydrous, the calcium and barium salts are monohydrates, the magne­ sium salt is a dihydrate, and the zinc salt a trihydrate. The crystal and molecular structure of the magnesium salt has been determined by single crystal X-ray diffraction methods (mono­ clinic, space group P2i, Z = 2). The lattice contains isolated complexes with hexacoordinate magnesium atoms chelated by two mandelate anions through one of their carboxylate oxygen atoms and the alcoholic hydroxyl group. Two water molecules in cis position are completing the octahedral coordination sphere. [MgtQITO^MfTO^] is thus a true mononuclear magnesium complex. Its stability and non-hygroscopic properties suggest its use as a magnesium and/or mandelate drug. 
  Reference    Z. Naturforsch. 53b, 1098—1102 (1998); received July 23 1998 
  Published    1998 
  Keywords    Mandelic Acid, Magnesium Mandelate, Alkaline Earth Mandelates, Alkali Mandelates, Zinc Mandelate Lithium, sodium, potassium, ammonium, magnesium, calcium, strontium, barium 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1098.pdf 
 Identifier    ZNB-1998-53b-1098 
 Volume    53