The one dimensional chain structures of vanadyl glycolate and vanadyl acetate

Abstract

The solvothermal reaction, at 200 °C, of vanadium pentoxide and lithium hydroxide in acetic acid or ethylene glycol leads to the formation of vanadyl acetate and vanadyl glycolate respectively. The structure of the acetate contains vanadium in octahedral coordination whereas the glycolate contains VO₅ square pyramids. The VO₆ octahedra in the acetate, VO(CH₃COO)₂, are joined through the vanadyl groups, giving a rather long VO bond of 1.684(7) Å and a short trans V-O bond of 2.131(7) Å, and by bridging acetate groups. The vanadium atoms interact along the ⋯VO⋯VO⋯ chain giving one-dimensional antiferromagnetic behavior. In contrast in the glycolate, the apical VO bond is shorter, 1.58(1) Å, and the square pyramids share edges in a two up–two down fashion to give chains of formula VO(OCH₂CH₂O). Magnetic susceptibility of vanadyl glycolate is consistent with an isolated spin dimers model.