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Title: Oxidoperoxidotungsten(VI) and dioxidotungsten(VI) complexes catalyzed oxidative bromination of thymol in presence of H2O2-KBr-HClO4
Authors: Maurya, Mannar Ram
Rana L.
Avecilla F.
Published in: Inorganica Chimica Acta
Abstract: Two oxidoperoxidotungsten(VI) complexes and the corresponding dioxidotungsten(VI) complexes of tridentate ONO donor Schiff base ligands, H2hap-nah (I) and H2hap-bhz (II) (Hhap = 2-hydroxyacetophenone, nah = nicotinoylhydrazide and bhz = benzoylhydrazide) have been reported. Complexes [WVIO(O2)(hap-nah)(MeOH)] (1), [WVIO(O2)(hap-bhz)(MeOH)] (2), [WVIO2(hap-nah)(MeOH)] (3) and [WVIO2(hap-bhz)(MeOH)] (4) have been characterized by elemental analysis, spectroscopic (IR, UV-Vis, 1H and 13C NMR) and thermogravimetric studies. Single crystal X-ray analysis of 2 and [WO(O2)(hap-inh)(MeOH)] (inh = isonicotinoylhydrazide) (whose synthesis has already been reported in the literature) confirms dibasic tridentate behavior of the ligands and their coordination to the metal ion through two oxygen and a nitrogen atoms. These complexes catalyze oxidative bromination of thymol, a model oxidative halogenation reaction normally shown by vanadium complexes, under acidic (HClO4) condition using 30% H2O2 in the presence of KBr. Under optimized reaction conditions, the selectivity of products follows the order: 4-bromothymol > 2,4-dibromothymol > 2-bromothymol. © 2015 Elsevier B.V. All rights reserved.
Citation: Inorganica Chimica Acta, 440: 172-180
Issue Date: 2016
Publisher: Elsevier S.A.
Keywords: Catalytic activity
Dioxidotungsten(VI) complexes
NMR spectroscopy
Oxidative bromination of thymol
Oxidoperoxidotungsten(VI) complexes
Tridentate ONO donor Schiff base ligands
ISSN: 201693
Author Scopus IDs: 7005255411
Author Affiliations: Maurya, M.R., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Rana, L., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Avecilla, F., Departamento de Química Fundamental, Universidade da Coruña, Campus de A Zapateira, A Coruña, 15071, Spain
Funding Details: One of the authors (L.R.) is thankful to Council of Scientific and Industrial Research, New Delhi for Junior Research Fellowship. Bangladesh Council of Scientific and Industrial Research, BCSIR
Corresponding Author: Maurya, M.R.; Department of Chemistry, India; email:
Appears in Collections:Journal Publications [CY]

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