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Structure and Dynamics of Lanthanide Complexes of Triethylenetetramine-N,N,N',N...
Zitha-Bovens, Emrin; Muller, Robert N.; Laurent, Sophie; Vander Elst, Luce; Geraldes, Carlos F. G. C.; van Bekkum, Herman; Peters, Joop A.A multinuclear NMR study on [Ln(ttha)]3- and [Lnttha(NHR)2]- complexes (R=Et, CH2(CHOH)4CH2OH) shows that coordinating groups of the organic ligands in these complexes are occupying all coordination sites of the metal ions, leaving no space for coordination of H2O molecules (H6ttha=triethylenetetramine-N,N,Nprime,NPrime,Nprimeprimeprime,Nprimeprimeprime-hexaacetic acid). The lanthanides of the first half of the...
Potentiometric and NMR spectroscopic study of protonations and amide hydrogen e...
Lammers, Hendrik; van der Heijden, Anna M.; van Bekkum, Herman; Geraldes, Carlos F. G. C.; Peters, Joop A.The macroscopic and microscopic protonations of DTPA-GlucA2 (DTPA-bis(glucamide)) have been investigated using potentiometry, 1H and 13C NMR. The protonation behavior appears to be similar to that of the corresponding bis(alkylamides), showing that it is not affected by the presence of the polyhydroxy side chains. Consideration of the various possible protonation pathways leads to the conclusion that the differ...
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