The Preparation and Crystal Structure of Ammonium Bis (glycolato) antimony (III), the First Structurally Characterised Discrete Monomeric Four-Coordinate Complex of Antimony (III) with a Dianionic α-Hydroxy Acid

Abstract

The antimony (III) complex with the α-hydroxy acid glycolic acid (hydroxyacetic acid), ammonium bis(hydroxyacetato) antimony(III), has been prepared and its structure determined by X-ray diffraction. The novel monomeric complex anion involves two glycolato(2-) ligands in bidentate coordination with the typical distorted pseudo trigonal bipyramidal stereochemistry about Sb. Bond lengths are Sb[sbnd]O(axial = carboxyl), 2·136(4), 2.200(5)Å and Sb[sbnd]O(equatorial = hydroxyl), 1-980(5), 1.985(4)Å.