Syntheses and structural characterization of trivalent lanthanide complexes of p-sulfonatothiacalix[4]arene

The X-ray crystallographic studies are reported for the water-soluble trivalent lanthanide complexes of the macrocyclic p-sulfonatothiacalix[4]arene [Gd(H2O)6((CH3)2SO)( p-sulfonatothiacalix[4]arene)]·H3Oþ·5H2O (1) and Na[Nd(H2O)6((CH3)2SO)(p-sulfonatothiacalix[4]arene)]·3H2O (2). The complexes are isostructural and belong to monoclinic system, C2/m space group. The Ln3þ metal ion is coordinated by the thiacalixarene ligand via the sulfonato group, and also ligated by an oxygen atom of a dimethyl sulfoxide (DMSO) molecule that occupies the cavity of the thiacalixarene and six aqua ligands. The thiacalixarenes are linked by the coordinated water molecules through hydrogen bonding to form a 2D polymer. The p-sulfonatothiacalixarenes maintain the clay-like bi-layer structure in the coordination network. q 2004 Elsevier B.V. All rights reserved.