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Dioxidomolybdenum(VI) and dioxidouranium(VI) complexes as functional mimic of haloperoxidases catalytic activity in presence of H2O2–KBr–HClO4
- Source :
- Inorganica Chimica Acta. 486:757-765
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- The stable dibasic tetradentate ligand 1,4-bis-(2-hydroxy-3,5-dimethylbenzyl)piperazine (H2pip-2,4-dmp, I) prepared by reacting 2,4-dimethylphenol with piperazine in the presence of formaldehyde reacts with [MoVIO2(acac)2] and [UVIO2(CH3COO)2] in equimolar ratio to give neutral hexa-coordinated [MoVIO2(pip-2,4-dmp)] (1) and hepta-coordinated [UVIO2(pip-2,4-dmp)(MeOH)] (2), respectively. After characterizing these complexes by spectroscopic (IR, UV/Vis, 1H and 13C NMR) data, elemental and thermal analyses (and single crystal X-ray diffraction study of uranium complex), they are used as catalysts to study the oxidative bromination of thymol. Such catalytic reactions are observed by many model vanadium complexes and are considered as a functional mimic of haloperoxidases. The catalytic oxidation resulted in the formation of three products namely, 2-bromothymol, 4-bromothymol and 2,4-dibromothymol. The optimized reaction conditions are obtained considering concentration of KBr, HClO4, and oxidant for the maximum yield of brominated products. Under the optimized reaction conditions, the product selectivity for both the prepared complexes is investigated. They are found to be competent homogeneous catalysts to afford the products in good yield.
- Subjects :
- Dibasic acid
010405 organic chemistry
Chemistry
Vanadium
chemistry.chemical_element
Halogenation
010402 general chemistry
01 natural sciences
0104 chemical sciences
Catalysis
Inorganic Chemistry
Piperazine
chemistry.chemical_compound
Catalytic oxidation
Yield (chemistry)
Polymer chemistry
Materials Chemistry
Physical and Theoretical Chemistry
Selectivity
Subjects
Details
- ISSN :
- 00201693
- Volume :
- 486
- Database :
- OpenAIRE
- Journal :
- Inorganica Chimica Acta
- Accession number :
- edsair.doi...........608ae89965d6199be7f5803d38adaeca