Synthesis and crystal structure of a novel praseodymium complex with β-alanine:

Abstract

The composition and crystal structure of the title complex are very different from those of α-alanine-lanthanide complexes reported previously. The structure of this complex comprises two kinds of polymer chains, both with dimeric repeat units. The two chains are very similar, taking a parallel and alternate arrangement in the lattice. In each dimeric unit, two praseodymium ions are connected by four carboxyl groups from β-alanine, two using simple bridges and two using tridentate bridges. A symmetry centre exists in each dimeric unit. The other two carboxyl groups link the units to each other by simple bridges. With two coordination water molecules for each central ion, the praseodymium ions are nine-coordinated, forming distorted, monocapped, square antiprism polyhedrons. A number of hydrogen bonds exist in the crystal.