Abstract
The solid compounds [La3(chel)(Hchel)3(H2O)8]·H2O (1) and [La(Hchel)(H2O)6]2[La2(Hchel)4(H2O)4]·10H2O (2) (H3chel = 4-hydroxypyridine-2,6-dicarboxylic acid or chelidamic acid) were isolated from aqueous solutions upon mixing La3+ cations and chelidamic acid at various pHs (pH 5−10). Compound 1 is a two-dimensional (2D) coordination polymer consisting of La(Hchel) and La(Hchel)2 units connected by coordination bonds. Compound 2 is an ion-pair complex made up of alternating layers of La(Hchel)+ and La2(Hchel)42− ionic units linked between them by lattice water molecules. The comparison of the two structures showed that the 2D coordination polymer, 1, is formed by a dehydration−condensation reaction between the La(Hchel)+ and La2(Hchel)42− units. The relative positions of these units in the crystal lattice suggest that the assembly of 1 takes place by a dehydration−condensation reaction between oligomeric layers of opposite charge and not by reaction between individual ions of opposite charge.
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