Tuning the topologies of Co(II) and Ni(II) complexes with EDTA, 1,3-PDTA and 1,4-BDTA ligands: Synthesis and spectroscopic data of [Mg(H 2O) 6][Co(1,4-bdta)] · 3H 2O and [Mg(H 2O) 6][Ni(1,4-bdta)] · 3H 2O complexes, and the X-ray structure of their chiral crystals

Abstract

The hexadentate complexes [Mg(H 2O) 6][Co(1,4-bdta)] · 3H 2O ( a) and [Mg(H 2O) 6][Ni(1,4-bdta)] · 3H 2O ( b) (where 1,4-bdta represents the 1,4-butanediaminetetraacetate ion) have been synthesized and characterized by electronic absorption spectroscopy and X-ray crystallography. The complexes ( a) and ( b) form isomorphic crystals that undergo a spontaneous resolution during the crystallization process yielding either enantiopure Λ (space group P6 1) or Δ (space group P6 5) isomers. The [M(1,4-bdta)] 2− (M = Co(II) ( a) and Ni(II) ( b)) and [Mg(H 2O) 6] 2+ octahedra are arranged in hydrogen bonded 2D-layers. Interception of these layers results in chiral channels filled with water molecules, which together with uncoordinated carboxylate oxygens of the complex anion, form mono-spiro chain that propagates in a helical manner along the c-direction. To the best of our knowledge, this is the first report on spontaneous resolution involving 1,4-bdta ligand and one of a few reports that concern conglomerate crystallization of M(II)(N 2O 4) complexes. The electronic absorption spectra of [Co(1,4-bdta)] 2− and [Ni(1,4-bdta)] 2− are presented and discussed in comparison with those of similar complexes and with reference to the varying topologies of these complexes.