Tetra­kis(5,7-dimethyl­quinolin-8-olato-κ²N,O)zirconium(IV) dimethyl­form­amide disolvate

In the title compound, [Zr(C₁₁H₁₀NO)₄]·2C₃H₇NO, the Zr^IV ion is coordinated by four bidentate 5,7-dimethylquinolin-8-olate ligands in a slightly distorted square-anti­prismatic coordination environment. The asymmetric unit also contains two N,N′-dimethyl­formamide (DMF) solvent mol­ecules. In the crystal, a weak C—H...O hydrogen bond links the complex mol­ecule to a solvent mol­ecule and weak π–π stacking inter­actions [centroid–centroid distance = 3.671 (3) Å] also occur. One of the DMF solvent mol­ecules was refined as disordered over three sets of sites, with refined occupancies in the ratio of 0.391 (9):0.342 (10):0.267 (7).

(μ₁-Methano­lato-κ¹O)-μ₁-methoxo-κ¹O-(μ₂-2-amino-1-methyl-5H-imidazol-4-one-κ²N:N′)-hexa­carbonyl­dirhenium(I)

In the title compound, [Re₂(CH₃O)₂(CO)₆(C₄H₆N₃O)], the two Re^I atoms are linked by a methoxo and methanolato bridge, as well as by a creatinine ligand that coordinates in a bidentate fashion. Three fac-carbonyl ligands occupy the rest of the slightly distorted octa­hedral geometry around each Re^I atom. The bridging methanolato and methoxo ligands are bent out of the Re₂O₂ plane by 49.2 (4) and 47.8 (3)° respectively. This is normally associated with a methanolato-bridging-type coordination rather that the more planar methoxo-type bridging. Furthermore, the creatinine bridging molecule is very slightly distorted from the Re₂N₂C plane, indicating that the pyrazolo N atom bonded to the Rh^I atom is not protonated. Charge balance can thus only be attained if one assumes a positional disorder for the methanolato/methoxo H atom. All attempts to locate disordered protons around these O atoms were unsuccessful. Four hydrogen bonds, one N—H...O and three C—H...O, are observed in the structure. The mol­ecules pack in a head-to-head and tail-to-tail fashion when viewed along the c axis, in alternating columns.

μ-(2,2′-Bipyrimidine)-bis­[dichlorido­palladium(II)] dimethyl­formamide monosolvate

In the title compound, [Pd₂Cl₄(C₈H₆N₄)]·C₃H₇NO, the two Pd²⁺ cations have a distorted square-planar coordination sphere and are bridged by a bis-bidentate 2,2′-bipyrimidine ligand. Two terminal chloride anions are also bonded to each of the Pd²⁺ cations. The dinuclear complex and the dimethylformamide solvate molecule lie on the inter­section of a twofold rotation axis and a mirror plane, with disorder present in the solvate mol­ecule. There is a slight distortion from the square-planar metal geometry, as indicated by the bite angles of 81.77 (13)° and 91.63 (5)°. The C and O atoms of the solvent mol­ecule are disordered over two sets of sites of equal occupancy.

(Acetyl­acetonato-κ²O,O′)dichlorido­bis(methano­lato-κO)niobium(V)

In the title compound, [Nb(CH₃O)₂(C₅H₇O₂)Cl₂], a slightly distorted octa­hedral coordination geometry is observed around the Nb^V atom with Nb—O distances in the range of 1.8254 (16)–2.0892 (16) Å and Nb—Cl distances of 2.3997 (14) and 2.4023 (12) Å. The O—Nb—O angles vary between 81.36 (7) and 172.65 (7) °, while the trans Cl—Nb—Cl angle is 167.34 (2)°. There are no hydrogen bonds observed.

(Nitrato-κO)tris­[tris­(4-fluoro­phen­yl)phosphane-κP]copper(I)

In the title complex, [Cu(NO₃)(C₁₈H₁₂F₃P)₃], the ligating atoms define a distorted tetrahedon with the three tris­(4-fluoro­phen­yl)phosphane ligands in the basal positions and the nitrate ligand in the axial position. The intra­molecular π–π inter­action [centroid–centroid distance = 3.6113 (11) Å] between two of the 4-fluoro­phenyl groups is complemented by both C—H...F and C—H...O inter­actions with distances in the range 2.51–2.60 Å, resulting in a tight head-to-tail packing.

4-(2-Chloro­phenyl­amino)-pent-3-en-2-one

In the title compound, C₁₁H₁₂ClNO, intra­molecular N—H...O hydrogen bonding is present. The dihedral angle between the benzene ring and the pentenone unit is 46.52 (5)°. In the crystal, C—H...O inter­actions between hydrogen atoms of the aryl moiety and two separate oxygen atoms occur, leading to a three-dimensional network.