Chiral oxidovanadium(V) complexes with tridentate Schiff bases derived from S(+)-2-amino-1-propanol: Synthesis, structure, characterization and catalytic activity

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• 作者：Grzegorz Romanowski^a ; ^{greg@chem.univ.gda.pl} ; Tadeusz Lis^b
• 关键词：Vanadium(V) ; Schiff base ; Complex ; Amino alcohol ; Sulfoxidation
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：394
• 期：Complete
• 页码：627-634
• 全文大小：643 K

文摘

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 ¦Ì-oxido-bis({S(+)-2-[(1-oxidopropyl)iminomethyl]-4-nitrophenolato-¦Ê³N,O,O¡ä}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)¡ã and V-O distances of 1.794(2) and 1.826(2) ?. 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.