Marietjie Schutte

Aqua­tricarbon­yl(3,5,7-tribromo­tropolonato)rhenium(I) methanol solvate

The title complex, [Re(C7H2Br3O2)(CO)3(H2O)]·CH3OH, crystallized as a neutral ReI compound and one methanol solvent molecule in the asymmetric unit. The metal centre is coordinated facially by three carbonyl groups. The bidentate tribromotropolanate ligand and a water molecule complete the distorted octahedral coordination around the central metal. Intermolecular Br⋯O [3.226 (5) Å] and Br⋯Br [3.590 (2) Å] contacts are observed between adjacent molecules. These contacts, together with an array of O—H⋯O, O—H⋯Br and C—H⋯O hydrogen bonds, complete a three-dimensional polymeric network formed between the methanol solvent and the complex.

Tetra­ethyl­ammonium bromidotricarbon­yl(tropolonato)rhenate(I)

In the title salt, (C8H20N)[ReBr(C7H5O2)(CO)3], the ReI atom is octahedrally surrounded by three facially orientated carbonyl ligands, one bidendate tropolonate ligand and a bromide ligand. The small O—Re—O bite angle of 74.88 (12)° leads to a distortion of the octahedral coordination sphere. The bromide ligand and the axial carbonyl ligand are substitutionally disordered over two positions in a 0.922 (3):0.078 (3) ratio. An array of C—H⋯O and C—H⋯Br hydrogen-bonding interactions between the cations and neighbouring rhenate anions stabilizes the crystal packing.

Aqua­tricarbon­yl(4-carboxy­pyridine-2-carboxyl­ato-κ2N,O2)rhenium(I)

There are two molecules with similar bond dimensions in the asymmetric unit of the title complex, [Re(C7H4NO4)(CO)3(H2O)]. The metal centre is coordinated facially by three carbonyl groups, is chelated by a 4-carboxypyridine-2-carboxylate ligand and is also coordinated by a water molecule. O—H⋯O hydrogen bonds give rise to a three-dimensional network.

[N,N-Bis(diphenyl­phosphino)propyl­amine-κ2P,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.

N-Benzyl-isatin.

In the title compound, C15H11NO2, two C—H⋯O hydrogen bonds are observed in the crystal structure, as well as π–π stacking with a centroid–centroid distance of 3.623 (2) Å. The planarity of the two ring systems is illustrated by very small deviations of all the atoms from these planes [largest deviations = 0.003 (3) and 0.010 (3) Å for the phenyl and fused-benzene rings, respectively]. The dihedral angle between these two planes is 77.65 (9)°.

Tetra-μ(3)-hydroxido-tetra-kis-[tricarbonyl-rhenium(I)] pyridine tetra-solvate.

The title compound, [Re4(μ3-OH)4(CO)12]·4C5H5N, crystallizes with one tetranuclear rhenium(I) cubane-like molecule and four pyridine molecules in the asymmetric unit. The coordination environment of each ReI atom is distorted octahedral. Four intramolecular O—H⋯N and four intermolecular C—H⋯O hydrogen-bond interactions are observed. Relatively strong hydrogen bonds are found between the hydrogen-bond donor (μ3-OH) and acceptor (basic N atom of pyridine), with N⋯O distances between 2.586 (10) and 2.628 (10) Å. Intercube distances of 9.873 (2) and 12.376 (3) Å are observed.

5-(Trifluoro­meth­oxy)isatin

The title compound [systematic name: 5-(trifluoromethoxy)-1H-indole-2,3-dione], C9H4F3NO3, crystallized with two molecules in the asymmetric unit. Intermolecular N—H⋯O hydrogen bonds link the molecules to form layers parallel to the ab plane. In addition, π–π stacking interactions are observed with a centroid–centroid distance of 3.721 (1) Å. The near planarity of the two isatin ring systems is illustrated by by the maximum deviations of 0.023 (1) and 0.025 (1) Å for the N atom in each case.

(μ(1)-Methano-lato-κ(1)O)-μ(1)-methoxo-κ(1)O-(μ(2)-2-amino-1-methyl-5H-imidazol-4-one-κ(2)N:N')-hexa-carbonyl-dirhenium(I).

In the title compound, [Re2(CH3O)2(CO)6(C4H6N3O)], the two ReI 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 ReI 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 RhI 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.

Bis[4-(4-bromophenylimino-κN)pent-2-en-2-olato-κO]copper(II).

In the title compound, [Cu(C11H11BrNO)2], the CuII atom is in a distorted square-planar geometry, with the two bidentate ketimine ligands positioned in a trans geometry. Two intermolecular C—H⋯O hydrogen bond interactions are present which link the molecules in a zigzag manner along the a axis. The molecules pack in layers along the diagonal of the bc plane.

[Bis(pyridin-2-ylmeth-yl)amine-κ(3)N,N',N'']tricarbonyl-rhenium(I) bromide hemihydrate.

The title compound, fac-[Re(C12H12N3)(CO)3]Br·0.5H2O, crystallizes with a cationic rhenium(I) unit, a bromide ion and half a water molecule, situated on a twofold rotation axis, in the asymmetric unit. The ReI atom is facially surrounded by three carbonyl ligands and a tridentate bis(pyridin-2-ylmethyl)amine ligand in a distorted octahedral environment. N—H⋯Br, O—H⋯Br, C—H⋯O and C—H⋯Br hydrogen bonds are present in the crystal structure and π–π stacking is also observed [centroid–centroid distances = 3.669 (1) Å and 4.054 (1) Å], giving rise to a three-dimentional network. The molecules pack in a head-to-head fashion along the ac plane.