Carla Pretorius

(Benzoyl­acetonato-κ2O,O′)dicarbonyl­rhodium(I)

In the title compound, [Rh(C10H9O2)(CO)2], a distorted square-planar coordination geometry is observed around the RhI atom, formed by the O atoms of the bidentate ligand and two C atoms from the carbonyl ligands. The RhI atom is displaced from the plane through the surrounding atoms by 0.017 Å. In the crystal, C—H⋯O interaction is observed between a methyl group of the bidentate ligand and a carbonyl O atom. Metallophilic interactions [3.308 (3) and 3.461 (3) Å] between neighbouring RhI atoms are encountered in the crystal, resulting in the formation of a metal chain along the b-axis direction.

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.

trans-Bis(1,3-diphenyl­propane-1,3-dionato)(methanol)oxidovanadium(IV) methanol disolvate

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.

Crystal structure of tetraethylammonium fac-tricarbonyl(hexafluoroacetylacetonato-κ2O,O′)-(nitrato-κO)rhenium(I), C16H21O8N2F6Re

Abstract C16H21O8N2F6Re, triclinic, P1̅, a = 9.161(5) Å, b = 10.283(5) Å, c = 12.974(5) Å, α = 87.739(5)°, β = 78.339(5)°, γ = 75.047(5)°, V = 1156.3(10) Å3, Z = 2, Rgt(F) = 0.037, wRref(F2) = 0.1012, T = 100(2) K.

Crystal structure of dichlorido bis(2-methylbenzothiazole-κ 1N)palladium( II) chloride, C16H14Cl2N2PdS2

C16H14Cl2N2PdS2, monoclinic, P21/c (no. 14), a = 8.154(3) Å, b = 13.826(3) Å, c = 8.518(6) Å,

A crystallographic and kinetic study ofO,O′-bidentate vanadium complexes

= 110.972(2)°, V = 896.7 Å, Z = 2, Rgt(F) = 0.0217, wRref(F ) = 0.0551, T = 296 K.

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

[VO(acac)2] (acac= acetylacetonate) and related complexes have been successfully synthesized and reported during the past few decades. Recent research has shown that vanadium β-diketonates are effective insulin mimicking agents with [VO(acac)2] and [VO(Et-acac)2] (Et-acac= 3-ethyl 2,4-pentane-dionate) in particular showing excellent activity [1-2]. This discovery, along with other industrial and medical applications, has been the key driving force for research into new frontiers of vanadium coordination chemistry.

Nucleophilicity of Oximes Based upon Addition to a Nitrilium closo-Decaborate Cluster

In the title compound, [Nb(CH3O)2(C5H7O2)Cl2], a slightly distorted octahedral coordination geometry is observed around the NbV 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.