Syntheses and characterization of Co2(4,4′-bipy)2(V4O12), Co(pz)(VO3)2 and Co2(2-pzc)(H2O)(VO3)3 (4,4′-bipy = 4,4′-bipyridine, pz = pyrazine, 2-pzc = 2-pyrazinecarboxylate)

Abstract

By using different organic ligands, three new inorganic–organic hybrid compounds of cobalt vanadium oxide have been synthesized hydrothermally: Co₂(4,4′-bipy)₂(V₄O₁₂) 1, Co(pz)(VO₃)₂2 and Co₂(2-pzc)(H₂O)(VO₃)₃3, where 4,4′-bipy = 4,4′-bipyridine, pz = pyrazine, 2-pzc = 2-pyrazinecarboxylate. Crystal data: 1, triclinic, space group P-, a = 8.164(2), b = 8.587(2), c = 10.162(2) Å, α = 87.04(3), β = 75.72(3), γ = 75.02(3)°; 2, orthorhombic, space group Pnna, a = 10.2793(8), b = 11.5639(9), c = 7.4822(6) Å; 3, orthorhombic, space group Pna2₁, a = 15.253(1), b = 8.2554(7), c = 10.6784(9) Å. Compound 1 contains {CoV₂O₆} layers cross-linked by 4,4′-bipyridine ligands. Compounds 2 and 3 are three-dimensional frameworks containing both infinite metavanadate chains and either {Co(pz)} or {Co₂(2-pzc)} chains. The magnetic properties of 1–3 are reported.