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1997 (1)
1995 (1)
1Author    M. Anuela Wagner3, R. Obert Ruloffb, EberhardH. Oyerb, Wilfried Gründer3Requires cookie*
 Title    New Gadolinium Complexes as Magnetic Resonance Imaging -Contrast Agents  
 Abstract    We have investigated the physicochemical and paramagnetic properties of the new gado­ linium complexes of N-(pyrid-2-yl-m ethyl)-ethylenediam ine-N,N',N'-triacetic acid (Gd-PED TA) and N -tris(2-am in oeth yl)am in e-N \N \N ",N ",N "\N '"-hexaacetic acid (Gd-TTA H A). The relaxivities as well as the thermodynamic and conditional stability constants of these complexes with respect to the physiological relevance were determined and discussed in comparison with the commercially available gadolinium(III) diethylenetriaminpentaacetic acid/ gadopentate dimeglumine (G d-DTPA, Magnevist®). In case of Gd-TTAHA a twofold higher relaxivity and a com plex stability similar to Gd-DTPA were determined. It is shown, that lower concentrations o f G d-TTA H A are sufficient for the same signal enhancement in the Tt-weighted MR image compared with Gd-DTPA and, thus, the use of the new contrast agent Gd-TTAHA should diminish risks for health. Therefore, Gd-TTAHA might be used potentially as a new contrast agent for clinical MRI application. 
  Reference    Z. Naturforsch. 52c, 508 (1997); received April 23/June 4 1997 
  Published    1997 
  Keywords    Gadolinium(III) Complexes, Contrast Agents, Relaxivities, Complex Stability Constants, Magnetic Resonance Imaging 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0508.pdf 
 Identifier    ZNC-1997-52c-0508 
 Volume    52 
2Author    Z. NaturforschRequires cookie*
 Title    Com plex F orm  
 Abstract    ation and M etal E x tractio n with H eterocyclic /3-Dicarbonyl C om pounds as C om parison. S tru ctu re of 3-Phenyl-4-benzoyl-5-isoxazolone E rh ard U hlem ann*, A lw in Friedrich, G erald H insche, W ulfhard M ickler, Acid constants and stability constants of nickel and zinc chelates with 2-thenoyltrifluoro-acetone, dibenzoylmethane, l-phenyl-3-methyl-4-benzoyl-5-pyrazolone and 3-phenyl-4-ben-zoyl-5-isoxazolone were compared. The extraction of copper was studied. Thermoanalytic measurements were made using the ligands and their copper compounds in the solid state. The molecular structure of 3-phenyl-4-benzoyl-5-isoxazolone was determined by X-ray analy­ sis. Crystal data: a = 874,7(2), b = 1959,2(7), c = 897,38(7) pm; ß = 101,030(7)°; space group P 12j/c 1; Z = 4; R = 0,043; 1920 observed, unique reflexions. 
  Reference    (Z. Naturforsch. 50b, 37—42 [1995]; eingegangen am 11. Juli 1994) 
  Published    1995 
  Keywords    3-Phenyl-4-benzoyl-5-isoxazolone, Crystal Structure, Thermal Stability, Complex Stability Constants, Dioxane/Water-Mixtures 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0037.pdf 
 Identifier    ZNB-1995-50b-0037 
 Volume    50