64020-02-6Relevant academic research and scientific papers
New polypodal polycarboxylic ligands - Complexation of rare-earth ions in aqueous solution
Viguier, Romain,Serratrice, Guy,Dupraz, Agnes,Dupuy, Claude
, p. 1789 - 1795 (2007/10/03)
The complexation ability of new polypodal carboxylic ligands prepared from 2,2-bis(hydroxymethyl)-1-alkanols was investigated in aqueous solution with Y3+ and various lanthanide ions (La3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+). The values of the stability constants for ML complexes are of the order of 104 for the hexadentate trioxypropionates, 107 for the hexadentate trioxyacetates and 1014 for the nonadentate triaminohexaacetates. In these systems, the nitrogens of the amino groups seem to be better chelating atoms than the oxygens of the ether groups. The hydration numbers of dysprosium(III) complexes have been determined from the DyIII-induced 17O NMR water shifts.
Regulation of molecular conformation of chiral tripodal structures by Ca2+ binding
Dayan, Izac,Libman, Jacqueline,Shanzer, Abraham,Felder, Clifford E.,Lifson, Shneior
, p. 3431 - 3439 (2007/10/02)
Chiral ligands are introduced whose conformations may be regulated by the presence of Ca2+ ions. These compounds are assembled from two types of C3-symmetric molecules as anchors (type 1 and type 2) and extended by chiral peptide res
