Syntheses of new 15-membered and 16-membered macrocyclic ligands with three pendant acetato groups and the structures of the gadolinium(III) complexes
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<sup>1</sup>H NMR of paramagnetic Dy<sup>3+</sup> complex with DTPA-amide p-xylylene-cyclophane; possible probing action toward D-histidine and histamine
2020, PolyhedronCitation Excerpt :The coordination geometry is too distorted for defining the symmetry axis, which is required for the calculation of pseudocontact shifts based on Eq. (1). A nine-coordination geometry has been reported for the X-ray structures of the ML-type complexes of rare-earth metals with DTPA and its aliphatic macrocyclic derivatives: the central metal ion is coordinated with three nitrogen and five oxygen atoms from the ligand, and the 9-th coordination site is occupied by a water molecule to construct a nine-coordination geometry [24–27]. When compared with this geometry, [M(cy)(H2O)2] chelate involves a large space open to water molecules, as a consequence of the high rigidity and steric hindrance of the macrocyclic framework.
Isomeric DTPA-amide macrocycles of p-xylenediamine and their complexation with Gd<sup>3+</sup>
2015, PolyhedronCitation Excerpt :A variety of chelating macrocycles are prepared by cyclization reactions between reagents bearing functional groups on their chain ends [1,2]. Reactions of DTPA (or diethylenetriaminepentaacetic) dianhydride with diamines yield chelating macrocycles, cy(DTPA-Amine)Hn, that incorporate diamines with amide linkages in the macrocyclic frames and carry pendant carboxymethyl arms [3−6]. When aromatic diamines are employed, the resulting cyclophane-type macrocycles have highly rigid frameworks that define the coordination properties toward metal ions [7].
Fluorescent aza-cyclophanes derived from diethylenetriaminepentaacetic acid (DTPA), and their complexation with Gd(III)
2012, PolyhedronCitation Excerpt :Diethylenetriaminepentaacetic acid (or DTPA) and its derivatives form stable complexes with trivalent metal ions including rare-earth metals [1–5]; special interest has been directed to Gd(III) complexes because of their practical or potential usefulness as contrast enhancers of magnetic resonance imaging (or MRI) [6–12].
Scandium, Yttrium, and the Lanthanides
2004, Comprehensive Coordination Chemistry IIComparison between Gd-DTPA and several bisamide derivatives as potential MRI contrast agents
2003, Bioorganic and Medicinal Chemistry