Abstract
AbstractThe formation of soluble supramolecular 3‐D coordination polymers with Nd3+ and La3+ in aqueous solution has been studied for two bifunctional ligands consisting of two pyridine‐2,6‐dicarboxylate groups connected at the 4‐position by O(CH2CH2O)4 and O(CH2CH2O)6 spacers (C4 and C6, respectively). Viscosity measurements were used to monitor the network formation as a function of the ligand concentration, and the ratio between metal ions and ligands. For corresponding conditions C4 solutions with Nd3+ always gave much higher viscosities than C6 solutions with Nd3+. C6 is long, and flexible enough to bind with both chelating groups to only one metal ion (ring formation). This causes the polymers to stop growing, resulting in smaller average sizes of the 3‐D polymers. The ring‐structures could be demonstrated by 1H NMR spectroscopy using C6 and La3+ at low concentrations. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
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