Deca(hydroxo)-23-Aqua-Hexa(lanthanum(III)) Iodide Octahydrate and Deea(hydroxo)-23-Aqua-Hexa(neodymium(III)) Iodide Octahydrate: Syntheses and Structures

摘要

New hexanuclear complexes of lanthanum and neodymium iodides, [La6(H2O)23(OH)_(10)]I8·8H2O (I) and [Nd6(H2O)_(23)(OH)_(10)]I8·8H2O (II), are synthesized and studied by X-ray diffraction analysis. The isos-tructural crystals of complexes I and II are orthorhombic: a = 13.197(4) A, b = 15.152(3) A, c = 15.302(4) A and a = 13.060(4) A,b = 14.967(5) A, c = 15.098(4) A, respectively; Z = 2, space group Pnnm. The lanthanum (neodymium) atoms coordinate the aqua and hydroxo ligands and enter the composition of the Ln6-containing complex cations. The coordination polyhedron (ignoring the central oxygen atom) of each atom of the com-plexing agent is somewhat distorted square antiprism with the aqua and hydroxo ligands being in the vertices. Four bridging ligands link this atom of the complexing agent with the four adjacent atoms.