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'Lanthanoids' in keywords Facet   section ZfN Section B  [X]
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1998 (1)
1997 (1)
1Author    Andre Wiesch3, Hauke Timmb, Karsten Bluhm3Requires cookie*
 Title    Uber CuDy2[B80 16] und CuHo2[B80 16]: Zwei neue "Metaborate" mit einem ^ [B80 16]g_-Anion On CuDy2[B80 16] and CuHo2[B80 16]: Two New "Metaborates" with a ^ [B80 16]8-Anion  
 Abstract    Nearly colourless single crystals of the compounds CuDy2 [B80 i 6] (I) and CuHo2[B80)6] (II) have been obtained by a B20 3 flux technique. They crystallize in the structure of CuTb2 [B80)6] (I) or in an orthorhombic variant (II). X-ray investigations on single crystals led to the space group C2h -P2!/c (Nr. 14) with lattice parameters a = 1025,5(10); b = 836,99(10); c = 621,2(8) pm, ß = 90.47(10)°; Z = 2 (I) and D^h -Pbam (Nr. 55) with a = 840,7(2), b = 616,6(2), c = 1022,0(2) pm, Z = 2 (II). The structures contain 1 [B80 16]8_ chains isolated from each other, which include tri-and tetracoordinated boron, T'fie chains consist of alternating twelve and eight-membered rings of boron and oxygen atoms connected by B 0 4 units. Dy,+ and H o 3+ are octacoordinated and Cu2+ is hexacoordinated in elongated octahedra by oxygen. The relation between these two structures is discussed. 
  Reference    (Z. Naturforsch. 53b, 1—4 [1998]; eingegangen am 23. Oktober 1997) 
  Published    1998 
  Keywords    Copper, Lanthanoids, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0001.pdf 
 Identifier    ZNB-1998-53b-0001 
 Volume    53 
2Author    Robert Ruloff, Thomas Gelbrich, Joachim Sieler, Eberhard Hoyer, Lothar BeyerRequires cookie*
 Title    Strukturen zweier isomerer Gadolinium(III)-Polyaminopolycarboxylate -Argumente für signifikante Unterschiede ihrer ^-NM R-Relaxation Structures of Two Isomeric Gadolinium(III) Polyamino Polycarboxylates -Relation to their Significant Differences in 'H NMR Relaxation  
 Abstract    We present preparation and X-ray crystal structures of gadolinium(III) complexes with two isomeric ligands; triethylenetetraminehexaacetic acid, H6ttha, and tris(2-aminoethyl)amine-hexaacetic acid, H6ttaha, respectively. In case of [C(NH2)3]2[Gd(Httha)] • 5 H20 (1) the inner coordination sphere is made up of 9 donor atoms of the ligand and reflects the low efficiency in accelerating 'H NMR relaxation of an aqueous solution. In case of [C(NH2)3]3[Gd(ttaha)] • 3 H20 (2) the coordination number of 9 is realized via 7 donor atoms of the ligand and 2 oxygen atoms of a pending acetate group of the adjacent complex. Luminescence studies in aqueous solution confirm replacement of this acetate group by 2 water molecules. The relaxivity of [Gd(Httaha)]2-is 7.3 ± 0.1 mM ~'s -1 as determined at pH = 7.2, 20 MHz and 40°C. 
  Reference    Z. Naturforsch. 52b, 805—809 (1997); eingegangen am 23. April 1997 
  Published    1997 
  Keywords    Gadolinium(III) Chelates, Solid State Structures, Lanthanoids, 'H NMR Relaxivity, Magnetic Resonance Imaging 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0805.pdf 
 Identifier    ZNB-1997-52b-0805 
 Volume    52