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• W2077466808 abstract "A series of mononuclear oxovanadium(V) complexes of tridentate Schiff bases HL1–HL4 and H2L5–H2L8 derived from 6-phenylsalicylaldehyde and 6-(2-hydroxyphenyl)salicylaldehyde and four different amines was synthesized. The systematically selected ligands contain aliphatic or aromatic nitrogen, or alkoxy- and phenoxy-oxygen as third donor atom. The complexes were characterised by spectroscopic methods in solution and the solid state. Single-crystal X-ray analyses were performed with VO2L1 (1), VO2L3·½EtOH (3), VO2L4 (4), VO(OiPr)L7·iPrOH (7), VO(OiPr)L8 (8) and H2L8. For all compounds the vanadium(V) cores contain distorted tetragonal pyramidal geometry around the dioxo- and oxovanadium site at which the N2O- and NO2-donor ligands bind equatorially. Complexes 1 and 3 display intramolecular hydrogen bonding of the pendant hydroxyphenyl group to a coordinated oxygen trans to a nitrogen atom and therefore serve as suitable models for the native site of vanadium dependent haloperoxidases. Variable-temperature 1H NMR spectra revealed significant hydrogen bond interaction in acetonitrile solution. In situ prepared catalysts are active for hydrogen peroxide mediated oxygenation of ethyl phenyl sulfide and showed complete conversion of the substrate to ethyl phenyl sulfoxide, together with small amounts of the corresponding sulfone, as detected by GC/MS after 10 min. The complex of H2L7 turned out to be most efficient while HL1 and HL2 were completely inactive. Catalysis is supported by the pendant OH group in the complex of HL3, the catalyst is twice as active as the complex of HL4." @default.
• W2077466808 created "2016-06-24" @default.
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• W2077466808 date "2004-01-01" @default.
• W2077466808 modified "2023-10-11" @default.
• W2077466808 title "Biphenyl derived Schiff-base vanadium(<scp>v</scp>) complexes with pendant OH-groups—structure, characterization and hydrogen peroxide mediated sulfide oxygenation" @default.
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• W2077466808 doi "https://doi.org/10.1039/b403600j" @default.
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