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The V atom in the oxovanadium(IV) complex [VO(H2biim)(H2O)3]SO4·2H2O, with a non-deprotonated 2,2′-bi­imidazole ligand (H2biim, C6H6N4), has a distorted octahedral coordin­ation with the vanadyl O atom in a trans position with respect to one of the water mol­ecules. The N—V—N angle within the five-membered chelate ring is the smallest in the coordination octahedron [78.66 (12)°]; the angles involving the vanadyl bond are somewhat wider than the corresponding angles involving the trans V—O(OH2) coordination bond.

The components dichloro­(N,N-dimethyl­formamide)[hydro­tris(pyrazol-1-yl)borato]vanadium(III), [TpVCl2(DMF)], and its partially oxidized analog chloro­(N,N-dimethyl­formamide)[hydro­tris(pyrazol-1-yl)borato]oxovanadium(IV), [TpVOCl(DMF)], cocrystallize in an approximately 1:1 ratio, viz. [V(C9H10BN6)Cl2(C3H6NO)][V(C9H10BN6)ClO(C3H6NO)]. The components both exist in the solid state with disorder of the Cl/O site and with V in a pseudo-octa­hedral coordination geometry. The complexes each have three pyrazole units of the hydro­tris(pyrazol-1-yl)borate ligand bound to one `face' of the vanadium center and one chloro, one oxo/chloro, and one oxo-bound N,N-dimethyl­formamide ligand bound to the other face.

Reaction of a vanadyl sulfate solution with a tetra­dentate Schiff base ligand derived from the condensation of o-vanillin and ethyl­enediamine in ethanol leads to the title compound, aqua­{6,6′-dimeth­oxy-2,2′-[1,2-ethanediylbis(nitrilo­methyl­idyne)]diphenolato-κ2N,O}oxovanadium(IV) monohydrate, [V(C18H18N2O4)O(H2O)]·H2O, in which the VIV atom is six-coordinated by two N atoms and four O atoms in a distorted octa­hedral configuration. In the crystal structure, mol­ecules are linked through O—H⋯O hydrogen bonding [O⋯O = 2.788 (4)–2.969 (4) A] to form a two-dimensional network.

Schiff-base ligands derived from triketones form stable complexes with VO. In the mononuclear vanadyl complex of 5,5'-(2-hydroxy­1,3-propandiyldiamino)bis(1-phenyl-1,3-hexanedione), vanadium is five-coordinate, equatorially bonded to four carbonyl O atoms in a nearly square-planar arrangement and axially to one other O atom. N atoms are not involved in complex formation. The hydroxy group is disordered.

In the reaction of bis(1,3-di­phenyl-1,3-propane­dionato)­oxovanadium(IV) with pyridine, a 1:1 adduct is formed, viz bis(1,3-di­phenyl-1,3-propane­dionato-κ2O,O′)­oxo­(pyridine-κN)­vanadium(IV), [V(C15H10O2)2O(C5H5N)]. The V atom is surrounded by one pyridine ligand, two 1,3-di­phenyl-1,3-propandionate (dbm) ligands and one oxo group. The complex exhibits a distorted octahedral coordination, with the oxo group and pyridine ligand in a cis configuration. Pairs of mol­ecules of the adduct are connected by an intermolecular C41—H41⋯O1(−x, 2 − y, 1 − z) contact of 3.171 (3) A and thus form dimers in the solid state.

The synthesis and characterization of the title VIV complex of a salicyl­ald­imine, [V(C20H14N2O4)O]·2C2H6OS·2H2O, is described. The reaction of 2,4-di­hydroxy­benz­aldehyde and 1,2-phenyl­enedi­amine with vanadyl sulfate produces a monomeric VIV complex. Its structure reveals that the vanadium(IV) ion is pentacoordinated and situated in a distorted square-pyramidal environment.

The crystal structure of the title compound, [VO(C5H9O3)2(C5H8N2)], has been obtained from single-crystal X-ray diffraction data measured at 150 K. The title compound provides a potential synthon for complexes that model V-containing haloperoxidases. The complex is pseudo-octa­hedral and the metal–oxo bond length is 1.595 (2) A.

The title compound {systematic name: bis[1,4(η5)-cyclopentadienyl]hexakis(μ-diethyl phosphito)-1:2κ6 P:O;3:4κ6 O:P-μ-oxalato-2:3κ4 O 1,O 2:O 1′,O 2′-dioxido-2κO,3κO-1,4-dicobalt(III)-2,3-divanadium(IV)}, [Co2V2(C5H5)2(C2O4)(C4H10O3P)6O2], is an oxalate-bridged dinuclear complex of oxovanadium(IV). The geometric center of the dimer lies on an inversion center. The unique Co atom is bonded to three P atoms and a cyclopentadienyl ring. The unique V atom has six O atom neighbors in an approximately octahedral arrangement; the V—O bond trans to the V=O bond is significantly lengthened.

[VO(C 15 H 22 BN 6 )(C 7 H 14 NS 2 ) cristallise dans P2 1 /n avec a=9,838, b=20,683, c=14,029 A, β=106,356, Z=4; affinement jusqu'a R=0,049. L'atome central V adopte une geometrie de coordination octaedrique deformee dans laquelle une face de l'octaedre est occupee par le coordinat tridente tris(«3,5»-dimethyl-«1»-pyrazolyl) hydroborate et la face opposee par les coordinats oxo et dipropyldithiocarbamato. La structure du complexe mononucleaire est comparee avec celle du complexe analogue diethyldithiocarbamato

[VCl 2 O(C 4 H 9 NO) 2 ] cristallise dans P2 1 2 1 2 1 avec a=8,635, b=12,237, c=13,683 A, Z=4, affinement jusqu'a R=0,043. Le complexe a une structure bipyramide rhomboedrique avec les deux coordinats chloro et l'oxygene vanadyle dans un plan quadratique

The title vanadium complex, [VClO(C16H22N4)]ClO4, of the tetradentate ligand N,N′-di­methyl-N,N′-bis(2-pyridyl­methyl)­ethane-1,2-di­amine was obtained from air oxidation of a mixture of the ligand and VCl3 in wet methanol.

The V atom in the title compound, [V(C13H10NO2)(C18H16N2O3)O], is O,O′-chelated by an N-benzoyl­hydroxy­laminate ligand and O,N,O′-chelated by a benzoyl­acetone 4-methoxy­benzoyl­hydrazonate ligand. The oxo O atom occupies the sixth coordination site of the octahedral coordination.

In the title compound, [VO(H2O)5](C7H5O6S)2·2H2O, the VIV atom is six-coordinated by O atoms (one vanadyl neighbour and five water mol­ecules) in a distorted octahedral configuration. The complex also contains two uncoordinated sulfosal­icylate anions and two uncoordinated water mol­ecules. Numerous O—H⋯O hydrogen bonds result in the formation of a three-dimensional network.

The two title mononuclear oxovanadium (IV) complexes, [VO(C30H22N2O6)(CH3OH)] and [VO(C22H22N2O6)]·H2O, respectively, have distorted square-pyramidal coordination and the 3-carboxy groups form intramolecular hydrogen bonds with the coordinated salicyl O atoms. In (I), methanol coordinates to the vanadium atom trans with respect to the oxo ligand.

The title mononuclear oxovanadium(IV) complex, [VO(C(36)H(38)N(2)O(2))], has a distorted square-pyramidal coordination. The complex was shown to be the exo isomer.