Hydrothermal synthesis and structural characterization of one-dimensional coordination polymers of cobalt(II) and nickel(II) with 1,3,5-benzenetriacetic acid

Transition metal complexes [M(Hbta)(H2O)4] [M=Co(II) (1), Ni(II) (2), H3bta=1,3,5-benzenetriacetic acid] have been prepared by reaction of H3bta with the M(OH)2 in water by hydrothermal method. The complexes were characterized by X-ray crystallography and electrospray mass spectrometry. The coordination geometries around Co(II) and Ni(II) atoms are both distorted octahedral with O6 donor set. And the conformation of flexible triacid is cis, trans, trans in the title complexes.