Abstract
The structure of the title complex, [Co(H2O)6][Co(C11H14N2O9)]2, is comprised of discrete [Co(Hpdta)]− anions (H4hpdta is 2-hydroxy-1,3-propanediamine-N,N,N',N'-tetraacetic acid) and [Co(H2O)6]2+ cations in a 2:1 molar ratio. The trivalent Co atom in the anion is coordinated by the hexadentate hpdta chelate ligand, with two aminoN atoms [Co—N 1.948 (3) A] and four O atoms of the four monodentate carboxylato groups [Co—O = 1.869 (2)–1.914 (2) A] in a distorted octahedral arrangement, whereas the divalent Co atom in the cation is coordinated in an octahedral manner by six aqua ligands [Co—O 2.078 (2)–2.124 (2) A]. The crystal structure is stabilized by extensive hydrogen bonding. Each aqua ligand forms two donor hydrogen bonds with the carboxyl O atoms from adjacent anions and the hydroxyl group forms a hydrogen bond with an adjacent carboxyl O atom.
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