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—O(axial = carboxyl), 2.136(4), 2.200(5) Å and Sb—O(equatorial = hydroxyl), 1.980(5), 1.985(4) Å.