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1998 (1)
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1Author    PeterG. Jones, Ralf Schelbach, Einhard SchwarzmannRequires cookie*
 Title    Hydroxy Complexes of Gold 2. Calcium Aurates [1]  
 Abstract    Two calcium aurate phases have been obtained as single crystals, phase 1 from H AUC1 4 + Ca(OH) 2 and phase 2 from NaAu(OH) 4 + Ca(C10 4) 2 . An X-ray structure determination of 1 shows its composition to be Ca 2 (0H) 3 (H 2 0) 4 [Au(0H) 4 ]. The apparent space group is Cmcm, but this corresponds to a sub-cell of the true structure. The disordered Cmcm structure was refined to R 0.032 for 813 reflections. The coordination geometry is square planar at gold (Au-O 1.97, 1.99 Ä), cubic at Ca(l) and octahedral at Ca(2). Phase 2 crystallizes in a primitive tetragonal cell with a 6.94, c 7.71 Ä; it is probably Ca[Au(OH) 4 ] 2 , but this has not yet been confirmed by a full structure determination. 
  Reference    Z. Naturforsch. 42b, 522—524 (1987); received December 2 1986 
  Published    1987 
  Keywords    Gold(III), Hydroxide, Calcium, Crystal Structure 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0522.pdf 
 Identifier    ZNB-1987-42b-0522 
 Volume    42 
2Author    PeterG. Jones, GeorgeM. Sheldrick, Einhard Schwarzmann, Andreas VielmäderRequires cookie*
 Title    Darstellung und Kristallstruktur von Di-gold(III)bis(selenit)oxid, Au2(Se03)20 Preparation and Crystal Structure of Di-gold(III) Bis(selenite) Oxide, Au2(Se03)20  
 Abstract    Au2(Se0s)20 was prepared from gold and excess selenic acid in a sealed tube at 533 K. The crystal structure [P6a2, a = 659.2(2), b = 1183.7(3), c = 399.8(1) pm, Z = 2,R = 0.087] was determined; gold atoms are bridged by oxide ions (lying on twofold axes) and selenite ions. The extended structure consists of polymeric layers parallel to the ««/-plane. The light atom positions are inaccurate because of the presence of a heavy atom in a polar space group. 
  Reference    (Z. Naturforsch. 38b, 10—11 [1983]; eingegangen am 20. September 1982) 
  Published    1983 
  Keywords    Crystal Structure, Sealed-tube Synthesis, Gold(III), Selenite, Oxide 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0010.pdf 
 Identifier    ZNB-1983-38b-0010 
 Volume    38 
3Author    JuliaA. Manskayaa, KonstantinV. Domasevitcha ', VeraV. Ponomareva2, Joachim Sielerb, VolodimirN. Kokozay2Requires cookie*
 Title    Crystal Engineering towards Design of Macrocyclic Coordination Compounds: Crystal Structure of Rubidium Tetrachloro-and Tetracyanoaurate(III) Complexes with 18-Crown-6  
 Abstract    The new macrocyclic complexes of composition Rb(18-crown-6)AuX4 (X = Cl (1) and CN (2)) have been prepared and characterized by X-ray crystallography (1: monoclinic, space group P2\/n, with a = 8.747(1), b = 8.366(1), c = 15.404(1) Ä; ß = 104.37(1)°, V = 1092.0(3) A , Z = 2; final R 1 =0.025 for 2030 independent reflections used; 2: monoclinic, space group P2\/c, with a = 14.765(3), 6 = 17.134(3), c = 8.855(2) k \ ß = 90.20(1)°, V = 2240.2(8) Ä3, Z = 4; final R 1 = 0.080 for 2034 independent reflections used). Both structures consist of Rb(18-crown-6)+ cations (A) and complex aurate(III) anions AuX4_ (B). Complex 1 has a linear polymeric array -A-B-A-B-(Rb-Cl 3.604(3), 3.654(3) Ä) with the rubidium ions disordered 0.276(2) A above and below the crown ether plane (Rb-O 2.819(5)-2.884(5) A, av. 2.846(5) A). The positioning of the rubidium atom away from the center of the 18-crown-6 is effected by the packing of the Rb(18-crown-6)+ and AuCU-moieties, and by the resemblance in the charge and symmetry of the cationic and anionic parts of the structure. Complex 2 has a zig-zag polymeric array -A-B-A-B-(Rb-N 2.92(2), 2.94(1) A) with orthogonal disposition of Rb(18-crown-6)+ and Au(CN)4-planes. The rubidium atom is situated 0.90(2) A above the mean plane of the macrocyclic oxygen atoms (Rb-O 2.93(5)-3.15(4) A) and adopts a typical "sunrise coordination". 
  Reference    Z. Naturforsch. 53b, 683—688 (1998); received January 5 1998 
  Published    1998 
  Keywords    18-Crown-6, Rubidium Macrocyclic Complexes, Gold(III), Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0683.pdf 
 Identifier    ZNB-1998-53b-0683 
 Volume    53