Tris(1,10-phenanthroline-κ2N,N′)iron(II) bis(2,4,5-tricarboxybenzoate) monohydrate and tris(2,2′-bipyridine-κ2N,N′)iron(II) 2,5-dicarboxybenzene-1,4-dicarboxylate–benzene-1,2,4,5-tetracarboxylic acid–water (1/1/2)

Abstract

The title compounds, tris(1,10-phenanthroline-κ2N,N′)iron(II) bis(2,4,5-tricarboxybenzoate) monohydrate, [Fe(C12H8N2)3](C10H5O8)2·H2O, (I), and tris(2,2′-bipyridine-κ2N,N′)iron(II) 2,5-dicarboxybenzene-1,4-dicarboxylate–benzene-1,2,4,5-tetracarboxylic acid–water (1/1/2), [Fe(C10H8N2)3](C10H4O8)·C10H6O8·2H2O, (II), were obtained during an attempt to synthesize a mixed-ligand complex of FeIIwith an N-containing ligand and benzene-1,2,4,5-tetracarboxylic acidviaa solvothermal reaction. In both mononuclear complexes, each FeIImetal ion is six-coordinated in a distorted octahedral manner by six N atoms from three chelating 1,10-phenanthroline or 2,2′-bipyridine ligands. In compound (I), the FeIIatom lies on a twofold axis in the space groupC2/c, whereas (II) crystallizes in the space groupP21/n. In both compounds, the uncoordinated carboxylate anions and water molecules are linked by typical O—H...O hydrogen bonds, generating extensive three-dimensional hydrogen-bond networks which surround the cations.