Bis(tetra­phenyl­arsonium) di-μ-hy­droxido-bis­[(nitrilo­triacetato)­cobalt(III)] octa­hydrate

In the title compound, (C24H20As)2[Co2(C6H6NO6)2(OH)2]·8H2O, the CoIII atom in the binuclear centrosymmetric anion is octa­hedrally surrounded by one N atom and three O atoms of the tetra­dentate nitrilo­triacetate ligand and two μ-hydroxide ligands. The crystal packing is controlled by C—H⋯O and O—H⋯O hydrogen-bonding inter­actions. The crystal employed in this study proved to be a two-component twin around (01)

N,N-Bis(diphenyl­phosphan­yl)cyclo­butanamine

In the title compound, C28H27NP2, the N atom adopts an almost planar geometry with the two P atoms and the C atom attached to it, with a distance of 0.066 (2) Å between the N atom and the C/P/P plane. The distorted trigonal–pyramidal geometry of the N atom is further illustrated by bond angles ranging between 115.22 (11) and 123.53 (8)°. Bond angles varying from 99.99 (9) to 108.07 (9) ° are indicative of the distorted pyramidal environment around the P atoms. An intra­molecular C—H⋯P hydrogen bond occurs. In the crystal, inter­molecular C—H⋯π inter­actions link the mol­ecules into a supra­molecular network

N,N-Bis(diphenyl­phosphanyl)cyclo­propyl­amine

In the title compound, C27H25NP2, the diphenyl­phosphino groups are staggered relative to the PNP backbone. The dihedral angles between the phenyl rings bonded to each P atom are 51.74 (5) and 68.23 (4)°. The coordination around the N atom deviates from trigonal-pyrimidal geometry towards an almost planar arrangement between the N atom and the adjacent P and C atoms; the distance between the N atom and the plane formed by the adjacent C/P/P atoms is 0.098 (2) Å

2-(m-Tolyl­imino­meth­yl)phenol

The title compound, C14H13NO, is non-planar with a dihedral angle of 47.00 (6)° between the planes of the two aromatic rings. Intra­molecular hydrogen bonding is observed between the O—H group and the N atom, resulting in a phenol–imine tautomeric form

[N,N-Bis(diphenyl­phosphino)propyl­amine-κ2 P,P]bromidotricarbonyl­rhenium(I)

In the title compound, [ReBr(C27H27NP2)(CO)3], the ReI atom is octa­hedrally surrounded by three carbonyl ligands in a facial arrangement, a bromide ligand and the P,P′-bidentate ligand Bis(diphenyl­phosphino)propyl­amine. The compound exhibits substitutional disorder of the bromide ligand and the axial carbonyl ligand, with almost 50% occupancy for both Br amd CO [0.538 (4) and 0.462 (4), respectively]. In addition, the propyl chain on the N atom of the bidentate ligand exhibits a 0.648 (9):0.352 (9) disorder. C—H⋯O and C—H⋯Br hydrogen bonding consolidates the crystal packing

Di-μ-hydroxido-bis­[tris­(4,4,4-trifluoro-1-phenyl­acetyl­acetonato-κ2 O,O′)hafnium(IV)] dimethyl­formamide disolvate

The binuclear molecule of the title compound, [Hf2(C10H6F3O2)6(OH)2]·2C3H7NO, lies across an inversion centre and contains a HfIV atom which is eight-coordinated and surrounded by three chelating β-diketonato tris­(4,4,4-trifluoro-1-phenyl­acetyl­acetonate (tfba−) ligands and two bridging OH− groups in a distorted square-anti­prismatic geometry. The Hf—O bond lengths vary from 2.073 (2) to 2.244 (2) Å and the O—Hf—O bite angles vary from 73.49 (9) to 75.60 (9)°. Weak O—H⋯O hydrogen-bonding inter­actions are observed between the bridging hy­droxy groups and the dimethylformamide solvent mol­ecules. The unit cell contains solvent-accessible voids of 131 Å3, but the residual electron density in the difference Fourier map suggests no solvent mol­ecule occupies this void

N,N-Bis(diphenyl­phosphino)ethyl­amine

In the title compound, C26H25NP2, the diphenyl­phosphino groups are staggered relative to the PNP backbone, even though the ethyl substituent coordinated to the N atom is not sterically bulky. The N atom adapts an almost planar geometry with two P atoms and a C atom of the allyl group attached to it in order to accommodate the steric bulk of the phenyl groups and the alkyl group. The distortion of the trigonal-pyramidal geometry of the nitro­gen is further illustrated by the bond angles which range between 114.0 (1) and 123.7 (1)°. There are no classical inter­molecular inter­actions

Tetra­kis(quinolin-8-olato-κ2 N,O)hafnium(IV) toluene disolvate

In the title compound, [Hf(C9H6NO)4]·2C7H8, the hafnium metal centre is coordinated by four N,O-donating bidentate quinolin-8-olate ligands arranged to give a square-anti­prismatic coordination polyhedron with a slightly distorted dodeca­hedral geometry. The average Hf—O and Hf—N distances are 2.096 (3) and 2.398 (3) Å, respectively, and the average O—Hf—N bite angle is 70.99 (11)°. The crystal packing is controlled by π–π inter­actions between quinoline ligands of neighbouring mol­ecules and hydrogen-bonding inter­actions. The inter­planar distances vary between 3.138 (1) and 3.208 (2) Å, while the centroid–centroid distances range from 3.576 (1) to 4.074 (1) Å

Di-μ-hydroxido-bis[tris(1,1,1,5,5,5-hexa­fluoro­acetyl­acetonato-κ2 O,O′)hafnium(IV)] acetone solvate

The binuclear title compound, [Hf2(C5HF6O2)6(OH)2]·C3H6O, contains an HfIV atom which is eight coordinated and surrounded by three chelating β-diketonato 1,1,1,5,5,5-hexa­fluoro­acetyl­acetonate (hfaa) ligands and two bridging OH groups situated on a twofold rotation axis. The HfO8 coordination polyhedron shows a slightly distorted Archimedean square anti-prismatic coordination with average Hf—O, C—O, C—CMe distances of 2.19 (2), 1.26 (2) and 1.49 (2) Å, respectively, and an O—Hf—O bite angle of 75.3 (5)°. Weak O—H⋯O hydrogen bonding inter­actions are observed between one of the bridging hydr­oxy groups and the disordered solvent mol­ecule

1,1,1,5,5,5-Hexafluoro-2,4-dimeth­oxy­pentane-2,4-diol

The title compound, C7H10F6O4, was isolated as an unexpected product from a reaction of tantalum(V) methoxide with hexa­fluoro­acetyl­acetone in a methanol solution. The asymmetric unit consists of one half-mol­ecule with the middle C atom lying on a twofold axis. The crystal structure is stabilized by O—H⋯O and an array of C—H⋯F hydrogen-bonding inter­actions. These inter­actions link the mol­ecules into a stable supra­molecular three-dimensional network. The mol­ecules pack in a ribbon-like form in the ac plane as a result of these inter­actions