Oxovanadium alkoxides: structure, reactivity and vanadium-51 NMR characteristics. Crystal and molecular structures of tris(2-chloroethoxo)oxovanadium and aquadichlorooxobis(tetrahydrofuran)vanadium

Self-assembling properties of (arylimido)vanadium(V) compounds

“…Furthermore, a -isopropoxido-bridged dimeric structure, in which each vanadium atom is coordinated in a trigonal-bipyramidal geometry ( = 0.96) [13] with the imido and bridging isopropoxido ligands in the apical positions, is observed in the crystal packing. This result is in contrast to the corresponding oxovanadium(V) alkoxides [14] and chloroalkoxides [15], which are distorted from the ideal trigonal bipyramidal structure. A metalnitrogen multiple bond might lead to such a coordination geometry through ligand-to-metal donation.…”

New titanium(IV) and vanadium(IV) haloalkoxides: synthetic route and structural characterisation

“…By checking similar dimensions in other complexes, one arrives to the conclusion that the V-O/V-Cl bond length in 2 (2.073(2) Å) is very close to the average value between well-resolved V=O and V-Cl bond dimensions in octahedral vanadyl(IV) complexes, as seen for example in [VOCl 2 (OH 2 )(thf) 2 ]. 26 In this case, V=O and V-Cl distances are 1.584(4) Å and 2.400(11) Å, respectively.…”

Synthesis, Molecular Structure, and Olefin Polymerisation Activity of an Oxovanadium(V) Alkoxide with Unprecedented Chloride Bridging Ligands

“…This chemical shift is also in good agreement with that of other tetrahedrally coordinated dichloro(oxo)vanadium alkoxides in solution. [19,21] The 1 H and 13 C{ 1 H} NMR spectra of the title compound show the expected number of signals for the coordinated 2-methoxyethanolato ligand as well as the 1:1 relative intensity proton pattern for the methylene peaks in the 1 H NMR spectrum. The signals at lower field at δ ഠ 4.6 ppm in C 6 D 6 and δ ഠ 5.7 ppm in CDCl 3 are due to the VOCH 2 protons while those at δ ഠ 2.8 ppm in C 6 D 6 and δ ഠ 3.9 ppm in CDCl 3 are assigned to the CH 2 OMe methylene protons.…”

“…The signals at lower field at δ ഠ 4.6 ppm in C 6 D 6 and δ ഠ 5.7 ppm in CDCl 3 are due to the VOCH 2 protons while those at δ ഠ 2.8 ppm in C 6 D 6 and δ ഠ 3.9 ppm in CDCl 3 are assigned to the CH 2 OMe methylene protons. [9,19,21] Single crystals of the complex, suitable for X-ray diffraction, were obtained from cold n-hexane solutions. An OR-TEP drawing of the molecule is shown in Figure 1, and selected bond lengths and angles are given in the caption.…”