Structure and relaxivity of macrocyclic gadolinium complexes incorporating pyridyl and 4-morpholinopyridyl substituents

  • Aime S
  • Batsanov A
  • Botta M
 et al. 
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Octadentate NO ligands containing a coordinating pyridyl group form kinetically stable complexes with Eu and Gd that resist protonation; the structure of a representative Gd complex reveals a short Gd-N bond [2.535(1) A], and the water exchange rate (=2.7[times]10 s) is sufficiently fast so as not to limit the pH independent relaxivity (=5.3 mM s, 20 MHz).

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