Crystal structure of barium (cyclohexane-1,2-diaminetetraacetato)cobaltate(III) nonahydrate Ba[Co(Cdta)]2 · 9H2O

Abstract

The crystal structure of Ba[Co(Cdta)]2 · 9H2O has been determined by X-ray diffraction. The crystals are monoclinic, a = 15.9415(10) A, b = 7.8449(6) A, c = 32.230(2) A, β = 100.387(8)°, Z = 4, space group C2/c)). The cyclohexane-1,2-diaminetetraacetate ion forms the octahedral [Co(Cdta)]− complex through two donor nitrogen atoms and four oxygen atoms and is also connected to two barium atoms through oxygens. The Ba atoms are on a twofold axis. Its nearest environment comprises five O atoms of water molecules, one also being located on a twofold axis, and four O atoms of the four neighboring complex ions. This gives infinite layers parallel to the ab plane. All water molecules form hydrogen bonds within one layer.