Ling Ma, O. R. Evans, B. Foxman
Nov 12, 1999
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Inorganic Chemistry
Abstract
One-dimensional lanthanide coordination polymers with the formula Ln(isonicotinate)3(H2O)2 (Ln = Ce, Pr, Nd, Sm, Eu, Tb; 1a−f) were synthesized by treating nitrate or perchlorate salts of Ln(III) with 4-pyridinecarboxaldehyde under hydro(solvo)thermal conditions. Single-crystal and powder X-ray diffraction studies indicate that these lanthanide coordination polymers adopt two different structures. While Ce(III), Pr(III), and Nd(III) complexes adopt a chain structure with alternating Ln−(carboxylate)2−Ln and Ln−(carboxylate)4−Ln linkages, Sm(III), Eu(III), and Tb(III) complexes have a doubly carboxylate-bridged infinite-chain structure with one chelating carboxylate group on each metal center. In both structures, the lanthanide centers also bind to two water molecules to yield an eight-coordinate, square antiprismatic geometry. The pyridine nitrogen atoms of the isonicotinate groups do not coordinate to the metal centers in these lanthanide(III) complexes; instead, they direct the formation of Ln(III) coor...