Synthesis and crystal structure of potassium ethylenediaminetetraacetatocobaltate(III)

Abstract

The title compound, potassium ethylenediaminetetraacetatocobaltate(III) dihydrate, K[Co(edta)]·2H2O, was prepared. The crystal structure was determined by the single-crystal X-ray diffraction method at 293 K. It crystallizes in the orthorhombic space group P212121 with a = 6.432(3)Å, b = 10.098(5)Å, c = 22.740(11)Å, V = 1477.0(12)Å3, Dx = 1.899 g/cm3, and Z = 4. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0283 and 0.0722, respectively, for all 3416 independent reflections. The cobalt atom is coordinated by two ethylenediamine-nitrogen and four glycinato-oxygen atoms in an octahedral geometry, whereas the potassium ion is coordinated by four glycinato-oxygen and two wateroxygen atoms in a distorted octahedron. 2016