Hydro-thermal synthesis and crystal structure of a new lanthanum(III) coordination polymer with fumaric acid.

Hayet Anana,Chahrazed Trifa,Chaouki Boudaren,Hocine Merazig,Sofiane Bouacida

doi:10.1107/s2056989015007008

Abstract

The title compound, poly[diaquatris(μ4-but-2-enedioato)(μ2-but-2-enedioic acid)dilanthanum(III)], [La2(C4H2O4)3(C4H4O4)(H2O)2]n, was synthesized by the reaction of lanthanum chloride pentahydrate with fumaric acid under hydrothermal conditions. The asymmetric unit comprises an LaIII cation, one and a half fumarate dianions (L 2−), one a half-molecule of fumaric acid (H2 L) and one coordinated water molecule. Each LaIII cation has the same nine-coordinate environment and is surrounded by eight O atoms from seven distinct fumarate moieties, including one protonated fumarate unit and one water molecule in a distorted tricapped trigonal–prismatic environment. The LaO8(H2O) polyhedra centres are edge-shared through three carboxylate bridges of the fumarate ligand, forming chains in three dimensions to construct the MOF. The crystal structure is stabilized by O—H⋯O hydrogen-bond interactions between the coordinated water molecule and the carboxylate O atoms, and also between oxygen atoms of fumaric acid

Highlights

The title compound, poly[diaquatris(4-but-2-enedioato)(2-but-2-enedioic acid)dilanthanum(III)], [La2(C4H2O4)3(C4H4O4)(H2O)2]n, was synthesized by the reaction of lanthanum chloride pentahydrate with fumaric acid under hydrothermal conditions
Polyhedra centres are edge-shared through three carboxylate bridges of the fumarate ligand, forming chains in three dimensions to construct the MOF
Some metal coordination polymers using fumaric acid as ligand have been reported in the literature containing transition metals Cu (Dalai et al, 2002), Zn (Xie et al, 2003), and Mn (Devereux et al, 2000)

Summary

Introduction

The title compound, poly[diaquatris(4-but-2-enedioato)(2-but-2-enedioic acid)dilanthanum(III)], [La2(C4H2O4)3(C4H4O4)(H2O)2]n, was synthesized by the reaction of lanthanum chloride pentahydrate with fumaric acid under hydrothermal conditions. LaIII cation, one and a half fumarate dianions (L2), one a half-molecule of fumaric acid (H2L) and one coordinated water molecule. The crystal structure is stabilized by O—H O hydrogen-bond interactions between the coordinated water molecule and the carboxylate O atoms, and between oxygen atoms of fumaric acid

Results

Conclusion