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)

By using different organic ligands, three new inorganic-organic hybrid compounds of cobalt vanadium oxide have been synthesized hydrothermally: Co-2(4,4'-bipy)(2)(V4O12) 1, Co(pz)(VO3)(2) 2 and Co-2(2-pzc)(H2O)(VO3)(3) 3, where 4,4'-bipy = 4,4'-bipyridine, pz = pyrazine, 2-pzc = 2-pyrazinecarboxylate. Crystal data: 1, triclinic, space group P-(1) over bar, a = 8.164(2), b = 8.587(2), c = 10.162(2) Angstrom, alpha = 87.04(3), beta = 75.72(3), gamma = 75.02(3)degrees; 2, orthorhombic, space group Pnna, a = 10.2793(8), b = 11.5639(9), c = 7.4822(6) Angstrom; 3, orthorhombic, space group Pna2(1), a = 15.253(1), b = 8.2554(7), c = 10.6784(9) Angstrom. 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 {Co-2(2-pzc)} chains. The magnetic properties of 1-3 are reported.