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- Title
Synthesis, Characterization and Biomimetic Activity of Heterogenized Dioxidomolybdenum(VI) Complex and Its Homogeneous Analogue.
- Authors
Maurya, Mannar R.; Chauhan, Abhilasha
- Abstract
Cis-[MoVIO2(CH3-hptb)(MeOH)] (1) has been synthesized by the reaction of [MoVIO2(acac)2] and deferasirox [ICL670: 4-[3,5-bis(2-hydroxyphenyl)-1H-1,2,4-triazol-1-yl]benzoic acid, H3hptb, I] in 1:1 molar ratio in MeOH. Complex 1 has been characterized successfully by several spectral techniques, viz. FT-IR, UV–Vis, 1H and 13C NMR, elemental (CHN) and thermogravimetric analysis. The esterification of the carboxylic group of ligand was observed during the complexation process with molybdenum. The analogous heterogeneous complex [MoVIO2(hptb)(MeOH)]@APTMS-TiO2 (2) has been synthesized by immobilizing I on amine-functionalized TiO2, {[H2hptb]@APTMS-TiO2 (II)} and then reacting it with [MoVIO2(acac)2] in MeOH. Characterization of the immobilized complex was achieved through FT-IR, DRS, P-XRD, TEM, thermogravimetric analysis and MP-AES. Both the complexes have been utilized in synthesizing organobromine compounds through oxidative bromination of styrene in the presence of KBr, oxidant (30% aq. H2O2) and 70% aq. HClO4 at room temperature. With the formation of 2-bromo-1-phenylethane-1-ol and 1-phenylethane-1,2-diol under the optimized reaction conditions, 72 and 100% conversion of styrene was achieved in the presence of catalysts 1 and 2, respectively. The oxidative bromination of thymol with catalyst 2 provides 2-bromothymol (52%) and 2,4-dibromothymol (48%) with 100% conversion. Dioxidomolybdenum(VI) complex of ICL670 immobilized on amine-functionalized titania has been synthesized and used as a functional model of haloperoxidases for the oxidative bromination of thymol and styrene.
- Subjects
ORGANOBROMINE compounds; THERMOGRAVIMETRY; BENZOIC acid; BROMINATION; ORGANOPLATINUM compounds
- Publication
Topics in Catalysis, 2023, Vol 66, Issue 5-8, p420
- ISSN
1022-5528
- Publication type
Article
- DOI
10.1007/s11244-022-01747-7