Selten-Erd-Mandelate. Synthese und Kristallstrukturen von Pr(Man)3(ManH) und Er(Man)3(H2O)2 / Synthesis and Crystal Structures of Pr(Man)3(ManH) and Er(Man)3(H2O)2
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by
Claudia Bromant, Wassiliki Nika, Ingo Pantenburg, Gerd Meyer
2005 Volume 60, p753-757
Abstract
Pr(Man)<jats:sub>3</jats:sub>(ManH) and Er(Man)<jats:sub>3</jats:sub>(H<jats:sub>2</jats:sub>O)<jats:sub>2</jats:sub> (ManH = mandelic acid) have been synthesized by slow evaporation of aqueous solutions of rare-earth salts (Pr(OH)<jats:sub>3</jats:sub>, ErCl<jats:sub>3</jats:sub> · 6H<jats:sub>2</jats:sub>O) with mandelic acid (α-hydroxy-phenyl acetic acid, C<jats:sub>8</jats:sub>H<jats:sub>8</jats:sub>O<jats:sub>3</jats:sub>) and their crystal structures were determined on the basis of X-ray data. In the crystal structure of Pr(Man)<jats:sub>3</jats:sub>(ManH) (1) (monoclinic, P2<jats:sub>1</jats:sub>, a = 574.8(1), b = 3042.5(4), c = 908.4(1) pm, β = 92.09(2)°, Z = 2) the Pr(III) ions are surrounded by eight oxygen atoms in a distorted square antiprismatic fashion with distances Pr-O in the range 241 to 254 pm. These polyhedra are connected by coordinative bonds to chains paralleling the crystallographic [100] direction. In Er(Man)<jats:sub>3</jats:sub>(H<jats:sub>2</jats:sub>O)<jats:sub>2</jats:sub> (2) (orthorhombic, P212121, a = 577.7(3), b = 1816.3(13), c = 2329.4(13) pm, Z = 4) the crystal structure contains isolated complexes with octa-coordinated erbium atoms chelated by three mandelate anions through one of their carboxylate oxygen atoms and the alcoholic hydroxyl group. Two water molecules complete the distorted square antiprismatic coordination sphere.
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