Synthesis, Crystal Structure and Magnetic Property of a Coordination Polymer [Fe(HL)(H2O)](n)

Abstract

A coordination polymer, namely [Fe(HL)(H2O)](n) (1), has been synthesized hydrothermally using H3L (H3L=2-(4-carboxypyridin-3-yl)terephthalic acid) and FeSO4 center dot 7H(2)O. The compound crystallizes in the orthorhombic system, space group Pnna with a=1.454 65(11) nm, b=2.474 23(15) nm, c=0.735 65(4) nm, V=2.647 7(3) nm(3), D-c=1.802 g.cm(-3), Z=8, R=0.046 8 and wR=0.125 6 (I>2 sigma(1)). The HL2- moieties alternately link the adjacent Fe(II) centers to form a 1D chain motif. These 1D motifs are arranged into a 2D sheet structure by further coordination interactions of the HL2- ligands to Fe (II) ions. Furthermore, the neighboring metal-organic sheets in 1 are assembled, through the O-H center dot center dot center dot O hydrogen bonds, into a complex 3D supramolecular framework. For topological analysis, the 2D metal-organic network in 1 is a binodal 4,4-connected layer, which is defined by the point symbol of (4(3).6(2).8). Magnetic studies for compound 1 show a weak antiferromagnetic coupling between the nearest Fe(II) centers, with g=2.04 and J=-2.57 cm(-1). CCDC: 1437796.