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'Solid State Structures' in keywords Facet   Publication Year 1997  [X]
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1Author    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