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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
Bisht, Manisha
Avecilla, Fernando
Keywords: Coordination chemistry
Encapsulated compounds
ONN ligands
Issue Date: Nov-2011
Publisher: NISCAIR-CSIR, India
Abstract: Reaction between [V<sup>IV</sup>O(acac)<sub>2</sub>] 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 [V<sup>IV</sup>O(acac)(pydx-dmen)] (<b style="">1</b>). In (<b style="">1</b>), 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 O<sub>acac</sub> atoms complete the coordination sphere. The poorly stable oxidoperoxidovanadium(V) complex [V<sup>V</sup>O(O<sub>2</sub>)(pydx-dmen)] (<b style="">2</b>) has been prepared by the treatment of (<b style="">1</b>) with aqueous 30 % H<sub>2</sub>O<sub>2</sub>. Its formation has also been demonstrated in solution by treating (<b>1</b>) with H<sub>2</sub>O<sub>2</sub> 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, [V<sup>V</sup>O<sub>2</sub>(pydx-dmen)]-Y (<b>3</b>). The encapsulated complex, [V<sup>V</sup>O<sub>2</sub>(pydx-dmen)]-Y (<b>3</b>), catalyses the oxidation of styrene, methyl phenyl sulfide, diphenyl sulfide and cyclohexene using H<sub>2</sub>O<sub>2</sub> as oxidant in good yield.
Description: 1562-1573
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(11) [November 2011]

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