Wydział Chemii

Grzegorz Romanowski

Tadeusz Lis

2013

Inorganica Chimica Acta

394

627-634

10.1016/j.ica.2012.09.030

Naukowa

Angielski

Artykuł

A series of vanadium(V) complexes with chiral tridentate Schiff base ligands, obtained by a single condensation of S(+)-2-amino-1-propanol with salicylaldehyde and its derivatives, were prepared. The complexes were characterized by elemental analysis and by their IR, CD, UV–Vis, 1D (¹H, ⁵¹V) and 2D (COSY, gHSQC) NMR spectra. The X-ray analysis of μ-oxido-bis({S(+)-2-[(1-oxidopropyl)iminomethyl]-4-nitrophenolato-κ³N,O,O′}oxidovanadium(V)), V₂O₃(C₁₀H₁₀N₂O₄)₂, 7, revealed oxido-bridged dinuclear structure with, unexpectedly, two five-coordinate square-pyramidal geometries about metal atoms. The two O-bonded oxidovanadium units are in the twist-angular configuration with the V^V–O–V^V angle of 107.05(11)° and V–O distances of 1.794(2) and 1.826(2) Å. The vanadium(V) complexes have ability to catalyze the oxidation of sulfides [PhSR (R = Me, Bz)] in good yields and enantiomeric excesses, utilizing aqueous 30% hydrogen peroxide or cumene hydroperoxide (CHP) as oxidant.

vanadium (V), Schiff-base, Complex, amino alcohol, sulfoxidation

http://dx.doi.org/10.1016/j.ica.2012.09.030

http://www.elsevier.com