X-Ray analysis of the [1-(o-carboxymathoxyphenoxy)-2-(o-hydroxyphenoxy)ethanato-sodium] tetramer, a sodium–oxygen cubane structure

Abstract

The crystal structure of the title compound shows a tetrameric association, with alternating sodium and oxygen atoms at the corners of a cube, pentagonal bipyramidal co-ordination round each sodium, and each ligand in the tetramer co-ordinating to all four sodium ions; the hydroxy acid polyether ligands, L, are arranged in hydrogen-bonded dimmer pairs, as found in other L complexes.