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Ligands CH<jats:sub>2<\/jats:sub>(H<jats:sub>2<\/jats:sub><jats:bold>L<\/jats:bold>)<jats:sub>2<\/jats:sub> <jats:bold>I<\/jats:bold> and <jats:bold>II<\/jats:bold> were derived from 5,5\u2032\u2010methylenebis(salicylaldehyde) and <jats:italic>S<\/jats:italic>\u2010benzyldithiocarbazate [CH<jats:sub>2<\/jats:sub>(H<jats:sub>2<\/jats:sub>sal\u2010sbdt)<jats:sub>2<\/jats:sub>, <jats:bold>I<\/jats:bold>] or <jats:italic>S<\/jats:italic>\u2010methyldithiocarbazate [CH<jats:sub>2<\/jats:sub>(H<jats:sub>2<\/jats:sub>sal\u2010smdt)<jats:sub>2<\/jats:sub>, <jats:bold>II<\/jats:bold>]. Aerial oxidation of <jats:bold>1<\/jats:bold> and <jats:bold>2<\/jats:bold> in the presence of KOH or CsOH<jats:bold>\u00b7<\/jats:bold>H<jats:sub>2<\/jats:sub>O resulted in the formation of dioxidovanadium(V) complexes, K<jats:sub>2<\/jats:sub>[CH<jats:sub>2<\/jats:sub>{V<jats:sup>V<\/jats:sup>O<jats:sub>2<\/jats:sub>(sal\u2010sbdt)}<jats:sub>2<\/jats:sub>]<jats:bold>\u00b7<\/jats:bold>2H<jats:sub>2<\/jats:sub>O (<jats:bold>3<\/jats:bold>), Cs<jats:sub>2<\/jats:sub>[CH<jats:sub>2<\/jats:sub>{V<jats:sup>V<\/jats:sup>O<jats:sub>2<\/jats:sub>(sal\u2010sbdt)}<jats:sub>2<\/jats:sub>]<jats:bold>\u00b7<\/jats:bold>2H<jats:sub>2<\/jats:sub>O (<jats:bold>4<\/jats:bold>), K<jats:sub>2<\/jats:sub>[CH<jats:sub>2<\/jats:sub>{V<jats:sup>V<\/jats:sup>O<jats:sub>2<\/jats:sub>(sal\u2010smdt)}<jats:sub>2<\/jats:sub>]<jats:bold>\u00b7<\/jats:bold>2H<jats:sub>2<\/jats:sub>O (<jats:bold>5<\/jats:bold>) and Cs<jats:sub>2<\/jats:sub>[CH<jats:sub>2<\/jats:sub>{V<jats:sup>V<\/jats:sup>O<jats:sub>2<\/jats:sub>(sal\u2010smdt)}<jats:sub>2<\/jats:sub>]<jats:bold>\u00b7<\/jats:bold>2H<jats:sub>2<\/jats:sub>O (<jats:bold>6<\/jats:bold>). The compounds were characterized in the solid state and in solution, namely, by spectroscopic techniques (IR, UV\/Vis, EPR, <jats:sup>1<\/jats:sup>H, <jats:sup>13<\/jats:sup>C and <jats:sup>51<\/jats:sup>V NMR spectroscopy). It is demonstrated that the V<jats:sup>V<\/jats:sup>O<jats:sub>2<\/jats:sub> complexes <jats:bold>3<\/jats:bold>\u2013<jats:bold>6<\/jats:bold> are efficient and selective towards the oxidative bromination by H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> of styrene to yield 1,2\u2010dibromo\u20101\u2010phenylethane, 1\u2010phenylethane\u20101,2\u2010diol and 2\u2010bromo\u20101\u2010phenylethane\u20101\u2010ol, and of salicylaldehyde to yield 5\u2010bromosalicylaldehyde, 3,5\u2010dibromosalicylaldehyde and 2,4,6\u2010tribromophenol; they therefore act as functional models of vanadium\u2010dependent haloperoxidases. It is also shown that Cs<jats:sub>2<\/jats:sub>[CH<jats:sub>2<\/jats:sub>{V<jats:sup>V<\/jats:sup>O<jats:sub>2<\/jats:sub>(sal\u2010sbdt)}<jats:sub>2<\/jats:sub>]<jats:bold>\u00b7<\/jats:bold>2H<jats:sub>2<\/jats:sub>O (<jats:bold>4<\/jats:bold>) and Cs<jats:sub>2<\/jats:sub>[CH<jats:sub>2<\/jats:sub>{V<jats:sup>V<\/jats:sup>O<jats:sub>2<\/jats:sub>(sal\u2010smdt)}<jats:sub>2<\/jats:sub>]<jats:bold>\u00b7<\/jats:bold>2H<jats:sub>2<\/jats:sub>O (<jats:bold>6<\/jats:bold>) are catalyst precursors for the catalytic oxidation of styrene by peroxide to yield styrene oxide, benzaldehyde, 1\u2010phenylethane\u20101,2\u2010diol, benzoic acid and phenylacetaldehyde. Plausible intermediates involved in these catalytic processes were established by UV\/Vis, EPR and <jats:sup>51<\/jats:sup>V NMR spectroscopic studies. The V<jats:sup>V<\/jats:sup>O<jats:sub>2<\/jats:sub> complexes along with ligands <jats:bold>I<\/jats:bold> and <jats:bold>II<\/jats:bold> were also screened against HM1:1MSS strains of <jats:italic>Entamoeba histolytica<\/jats:italic>; the <jats:italic>IC<\/jats:italic><jats:sub>50<\/jats:sub> values of compounds <jats:bold>3<\/jats:bold>, <jats:bold>4<\/jats:bold> and <jats:bold>5<\/jats:bold> were significantly lower than that of metronidazole, thereby suggesting that they may be promising drugs for the treatment of amoebiasis.<\/jats:p>","DOI":"10.1002\/ejic.201200012","type":"journal-article","created":{"date-parts":[[2012,4,12]],"date-time":"2012-04-12T05:55:23Z","timestamp":1334210123000},"page":"2560-2577","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":69,"title":["Synthesis, Characterization, Catalytic and Antiamoebic Activity of Vanadium Complexes of Binucleating Bis(dibasic tridentate ONS donor) Ligand 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