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|Title:||Synthesis, characterisation and catalytic activities of vanadium complexes containing ONN donor ligand (E)-4-[(2-(dimethylamino)ethylimino] methyl-5-(hydroxymethyl)-2-methylpyridin-3-ol|
|Authors:||Maurya, Mannar R|
|Abstract:||Reaction between [VIVO(acac)2] and the ONN donor ligand (E)-4-[(2-(dimethylamino)ethylimino]methyl-5-(hydroxymethyl)-2-methylpyridin-3-ol (Hpydx-dmen) results in the formation of the complex [VIVO(acac)(pydx-dmen)] (1). In (1), the vanadium center adopts a distorted six-coordinated octahedral geometry where the ligand coordinates through one O and two N atoms; the oxo and two Oacac atoms complete the coordination sphere. The poorly stable oxidoperoxidovanadium(V) complex [VVO(O2)(pydx-dmen)] (2) has been prepared by the treatment of (1) with aqueous 30 % H2O2. Its formation has also been demonstrated in solution by treating (1) with H2O2 in methanol. Treatment of the ligand with vanadium(IV)–exchanged zeolite-Y followed by aerial oxidation gives the dioxidovanadium(V) complex encapsulated in the nano-cavity of zeolite-Y, [VVO2(pydx-dmen)]-Y (3). The encapsulated complex, [VVO2(pydx-dmen)]-Y (3), catalyses the oxidation of styrene, methyl phenyl sulfide, diphenyl sulfide and cyclohexene using H2O2 as oxidant in good yield.|
|Appears in Collections:||IJC-A Vol.50A(11) [November 2011]|
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