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In the title compound, [V(C7H3NO4)O(C10H8N2)]·C2H5OH, the VIV atom exhibits a distorted octa­hedral coordination environment formed by two pyridyl N atoms of 2,2′-bipyridine (bpy), the vanadyl O atom, and two carboxyl­ate O atoms and one pyridyl N atom of the tridentate pyridine-2,6-dicarboxyl­ate (pydc2−) ligand. The pyridyl N atom of the pydc2− anion and one pyridyl N atom of bpy occupy the axial positions. O—H⋯O hydrogen bonds involving the ethanol solvent mol­ecule as donor and a carboxyl­ate O atom as acceptor atoms, as well as C—H⋯O hydrogen bonds, together with π–π stacking inter­actions between adjacent aromatic rings (average centroid–centroid distance = 3.577 Å), seem to be effective in the stabilization of the crystal packing, resulting in the formation of a three-dimensional structure.

In the title complex, [Co(C4H7N2O2)2Cl(C6H7N)]·0.5H2O, the central CoIII ion, chelated by four N atoms of the two bidenate glyoximate ligands, exhibits a slightly distorted octa­hedral geometry. The axial positions are occupied by a chloride ion and the 4-methyl­pyridine N atom. Inter­molecular O—H⋯O hydrogen bonds link the mol­ecules in the crystal via the water mol­ecules, while the glyoximate ligands exhibit intra­molecular O—H⋯O hydrogen bonds.

The Zn atom in the title salt, [ZnCl(C12H8N2)2(H2O)]Cl·C3H7NO, is chelated by two phenanthroline mol­ecules and is bonded to one chloride ion and one water mol­ecule, resulting in a ZnN4ClO octa­hedral coordination environment with the Cl and O atoms in a cis conformation. The cations and anions are linked by O—H⋯Cl hydrogen bonds across a center of inversion, forming a hydrogen-bonded dimeric association. The dimethyl­formamide solvent mol­ecule is disordered over two orientations in a 0.56 (1):0.44 (1) ratio.

The title compound, [Co(C4H7N2O2)2Cl(C8H9NO2)]·CHCl3, was synthesized as a model complex of vitamin B12. The CoIII cation displays an approximately octa­hedral coordination environment, being displaced by 0.0240 (15) Å from the mean plane of the four N atoms of the equatorial plane. The O—H distances in the dimethyl­glyoximate hy­droxy groups are 0.89 (6) and 1.14 (6) Å; such long O—H bonds are very common in cobaloxime derivatives. Weak classical O—H⋯N and non-classical C—H⋯Cl hydrogen-bonding interactions further consolidate the crystal packing.

In the title compound, (C10H10NO)2[Ni(C7H3NO4)2]·CH3OH·H2O, the coordination geometry of the NiII atom can be described as distorted octa­hedral. In the crystal, noncovalent inter­actions play an important role in the stabilization of the structure, involving O—H⋯O, N—H⋯O and weak C—H⋯O hydrogen bonds and π–π stacking inter­actions between the pyridine rings of the pyridine-2,6-dicarboxyl­ate ligands [centroid–centroid distance = 3.7138 (15) Å] and between the 8-hy­droxy-2-methyl­quinolinium cations [centroid–centroid distances = 3.6737 (15), 3.4434 (14), 3.6743 (15), 3.7541 (16), 3.5020 (15) and 3.7947 (15) Å].

In the title compound, [InCl3(C12H12N2)(CH3OH)]·CH3OH, the InIII atom is six-coordinated in a distorted octa­hedral geometry by two N atoms from a chelating 4,4′-dimethyl-2,2′-bipyridine ligand, one O atom from a methanol mol­ecule and three Cl atoms. In the crystal, inter­molecular O—H⋯O and O—H⋯Cl hydrogen bonds link the complex and solvent methanol mol­ecules. Intra­molecular C—H⋯Cl hydrogen bonds are also present in the complex.

In the title compound, [RuCl(C15H11N3)(C12H8N2O4)]ClO4·C2H5OH·H2O, the geometry of the ClN5 coordination set around the RuII atom is close to octa­hedral, but distorted on account of the limited bite angles of the polypyridyl ligands. The complexes are linked by O—H⋯O hydrogen bonds between the carboxyl groups and the crystal lattice water mol­ecules into chains along [110]. Face-to-face stacking inter­actions are formed between terpyridine ligands, with inter­planar separations of 3.66 (1) and 3.42 (1) Å, and between bipyridine-4,4′-dicarb­oxy­lic acid ligands, with inter­planar separations of 3.65 (1) and 3.72 (1) Å. Three O atoms of the perchlorate ion are each disordered equally over two positions. The hy­droxy group of the ethanol mol­ecule is also disordered over two sites with refined occupancies of 0.794 (9) and 0.206 (9).

In the mononuclear title complex, [Zn(C10H8N2)2(C2H6OS)2](C24H20B)2·C2H6OS, the ZnII ion is coordinated by four N atoms of two bidentate 2,2′-bipyridine mol­ecules and by the O atoms of two cis-disposed dimethyl sulfoxide mol­ecules in a distorted octa­hedral geometry. The S atom and the methyl groups of one of the coordinated dimethyl sulfoxide mol­ecules are disordered in a 0.509 (2):0.491 (2) ratio. The crystal packing is stabilized by C—H⋯O hydrogen bonds between the dimethyl sulfoxide solvent mol­ecules and tetra­phenyl­borate anions.

The tridentate Schiff base ligand of the title complex, [V(C15H12N2O4)O(C12H8N2)]·C3H7NO, was derived from the condensation of 2-hy­droxy-1-naphthaldehyde and l-asparagine. The central VIV atom is six-coordinated by one oxide O atom, two N atoms from 1,10-phenanthroline and one N atom and two O atoms from the Schiff base ligand in a distorted octa­hedral geometry. In the crystal structure, inter­molecular N—H⋯O hydrogen bonds connect mol­ecules into centrosymmetric dimers. The C atoms of the dimethyl­formamide solvent mol­ecule are disordered over two sites with site-occupancy factors of 0.732 (13) and 0.268 (13).

The title compound, [V2(C13H16N3O3)2O4]·2C2H6OS, is a centrosymmetric dimeric complex solvated by two dimethyl sulfoxide mol­ecules. Each VV atom is six-coordinated by one oxide group, two N atoms and one O atom from the tridentate Schiff base ligand, and by two additional bridging O atoms in a distorted octa­hedral coordination geometry. Three atoms of the cyclo­hexane ring are each disordered over two sites, with occupancy factors of 0.501 (10) and 0.499 (10). C—H⋯O and N—H⋯O hydrogen bonds link the dimers and solvent mol­ecules into a supra­molecular network.

The VIV atom in the title complex, [V(C11H13BrClN2O)(C5H7O2)O], is six-coordinated by one phenolate O, one imino N and one amino N atom of the tridentate anionic Schiff base ligand, by one oxide O atom, and by two O atoms of an acetyl­acetonate anion, forming a distorted cis-VN2O4 octa­hedral coordination geometry. The deviation of the V atom from the plane defined by the three donor atoms of the Schiff base ligand and one O atom of the acetyl­acetone ligand towards the oxide O atom is 0.256 (2) Å.

In the title compound, [V(C15H11O2)2O(CH3OH)]·2CH3OH, the VIV atom is coordinated by two 1,3-diphenyl­propane-1,3-dionate ligands and an oxide ligand in an axial position. The sixth position is occupied by the O atom of a methanol group bonded trans to the oxide atom. The octa­hedral geometry is significantly distorted, with the VIV atom lying 0.330 (3) Å above the equatorial plane formed by the O atoms of the two β-diketonate ligands. In the crystal, O—H⋯O hydrogen bonds between the coordinating methanol group in the complex and the two methanol solvent mol­ecules lead to the formation of polymeric chains along the c-axis direction. Weak C—H⋯O contacts are also observed.

In the title compound, [Mn(C13H8N3O3)2]·C3H7NO·H2O, the metal atom is O,N,O′-chelated by two deprotonated Schiff bases and exists in a distorted octa­hedral geometry. The N–H groups, the carbonyl group of the DMF mol­ecule and the uncoord­inated water mol­ecule engage in N—H⋯O and O—H⋯O hydrogen-bonding inter­actions, generating a hydrogen-bonded ribbon that propagates along [110].

The VV atom in the title compound, [V(C8H9N2O)(C17H14N2O3)O]·CH3OH, is N,O-chelated by the benzoyl­hydrazidate anion and O,N,O′-chelated by the (benzoyl­hydrazono)propionate dianion. The octa­hedral trans-N2O4 coordination geometry is completed by the vanadyl O atom. Two mononuclear complexes and two solvent mol­ecules are linked by O—H⋯O and O—H⋯N hydrogen bonds, generating a centrosymmetric aggregate.

The VV atom in the title compound, [V(C7H6ClN2O)(C16H11ClN2O3)O]·CH3OH, is N,O-chelated by the benzoyl­hydrazidate anion and O,N,O′-chelated by the (benzoyl­hydrazinyl­idene)propionate dianion. The distorted octa­hedral trans-N2O4 coordination geometry is completed by the vanadyl O atom. The mononuclear and solvent mol­ecules are linked by N—H⋯O and O—H⋯O hydrogen bonds about a center of inversion, generating a dimer.

The title compound, (C10H10NO)2[Cu(C7H3NO4)2]·CH3OH·H2O was prepared by the reaction of copper(II) nitrate hexa­hydrate, 8-hy­droxy-2-methyl­quinoline, and pyridine-2,6-dicarb­oxy­lic acid in a 1:2:2 molar ratio in an aqueous solution. The geometry of the resulting CuN2O4 coordination can be described as distorted octa­hedral. In the crystal, there are several inter­molecular O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds. An intra­molecular N—H⋯O hydrogen bond occurs in one of the cations. Considerable π–π stacking inter­actions are also observed between the aromatic rings of the cations, with centroid–centroid distances of 3.4567 (13), 3.5342 (14), 3.6941 (14) and 3.4568 (13) Å. These non-covalent inter­actions connect the components, forming a three-dimensional supra­molecular structure.

The metal atom of the title compound, [Zn(C13H8N3O2S)2]·C3H7NO·H2O, is O,N,O′-chelated by two deprotonated Schiff bases and it exists in a distorted octa­hedral geometry. The N–H groups of the ligands, the carbonyl group of the DMF mol­ecule and uncoordinated water mol­ecule engage in N—H⋯O and O—H⋯O inter­actions, generating a hydrogen-bonded ribbon that propagates along [110]. One thienyl ring is disordered over two positions in a 1:1 ratio.

In the title compound, [Mo(C15H22BN6)Cl(NO)(C9H13N)]·CH2Cl2, the MoI atom adopts a distorted MoClN5 octa­hedral geometry with the hydro­tris­(3,5-dimethyl­pyrazol­yl)borate anion in an N,N′,N′′-tridentate tripodal (facial) coordination mode. A 4-tert-butyl­pyrine ligand, chloride anion and a nitrosyl cation complement the coodination of the MoI atom and an intra­molecular C—H⋯Cl hydrogen bond helps to stabilize the configuration of the complex mol­ecule. The packing is stabilized by an inter­molecular C—H⋯Cl hydrogen bond involving the complex mol­ecule and the CH2Cl2 solvent mol­ecule.

The reaction of nickel salts and 4,4′-bipyridine with 2,2′-bi­imidazole (H2biim) yielded the title complex, [Ni(C6H6N4)3](NO3)2·C3H7NO. The NiII atom is chelated by three H2biim ligands in a distorted octa­hedral coordination geometry. The two nitrate anions and one dimethyl­formamide (DMF) mol­ecule are not coordinated. The compound has a three-dimensional structure, formed by extensive hydrogen bonding between [Ni(H2biim)3]2+ cations and nitrate anions, each nitrate anion forming hydrogen bonds with an R 1 2(4) motif. The DMF molecule is disordered over three sets of sites, with occupancy ratios of 0.341 (16):0.350 (17):0.309 (19).

In the title compound, [Zn(NO3)2(C12H12N2)(H2O)], the ZnII atom is six-coordinated in a distorted octa­hedral geometry by two N atoms from a chelating 4,4′-dimethyl-2,2′-bipyridine ligand, one water O atom, one O atom from a monodentate nitrate anion and two O atoms from a chelating nitrate anion. In the crystal, there are aromatic π–π contacts between the pyridine rings [centroid–centroid distances = 3.9577 (13) Å] and inter­molecular O—H⋯O and C—H⋯O hydrogen bonds.

In the title compound, [Co(C8H5Cl2O3)(C12H12N2)], the CoII atom, lying on a twofold rotation axis, is coordinated by four O atoms from two chelating 2,4-dichloro­phen­oxy­acetate ligands and two N atoms from a 5,5′-dimethyl-2,2′-bipyridine ligand, displaying a distorted octa­hedral geometry. A three-dimensional supra­molecular structure is formed through inter­molecular C—H⋯O hydrogen bonds and π–π stacking inter­actions between the pyridine and benzene rings [centroid–centroid distance = 3.779 (2) Å].

In the title compound, [Cu(C2H3O2)2(C12H12N2)2]·H2O, the CuII atom exhibits a distorted octa­hedral coordination geometry, defined by two N atoms from one 4,4′-dimethyl-2,2′-bipyridine ligand and four O atoms from two acetate ligands. In the crystal, O—H⋯O hydrogen bonds are observed between the coordinated carboxyl­ate O atoms and the solvent water mol­ecule.

In the title compound, [Mn(C14H19N2O2)2Cl(H2O)]·H2O, the MnIII atom is N,O-chelated by two monoanionic Schiff bases, forming two six-membered chelate rings. One Cl atom and one water mol­ecule in trans positions complete a distorted octa­hedral geometry around the metal atom. In the crystal, the complex mol­ecules and the uncoordinated water mol­ecules are connected via O—H⋯N, O—H⋯O and O—H⋯Cl hydrogen bonds into layers parallel to the ac plane and these are consolidated by C—H⋯π inter­actions. The layers are further linked into a three-dimensional network through C—H⋯O inter­actions.

In the title complex, [PtCl2(C10H8N2)2]Cl2·H2O, the Pt4+ ion is six-coordinated in a distorted octa­hedral environment by four N atoms from the two 2,2′-bipyridine ligands and two Cl atoms. As a result of the different trans influences of the N and Cl atoms, the Pt—N bonds trans to the Cl atom are slightly longer than those trans to the N atom. The compound displays inter­molecular hydrogen bonding between the water mol­ecule and the Cl anions. There are inter­molecular π–π inter­actions between adjacent pyridine rings, with a centroid–centroid distance of 3.962 Å.

The title compound, [Fe(C6H4N5)2Cl(H2O)], was synthesized by hydro­thermal reaction of FeCl3 with 2-(1H-tetra­zol-5-yl)pyridine. The iron(III) metal centre exhibits a distorted octa­hedral coordination geometry provided by four N atoms from two bidentate organic ligands, one water O atom and one chloride anion. The pyridine and tetra­zole rings are nearly coplanar [dihedral angles = 4.32 (15) and 5.04 (14)°]. In the crystal structure, inter­molecular O—H⋯N hydrogen bonds link the complex mol­ecules into a two-dimensional network parallel to (100).