Polymer-anchored peroxo compounds of molybdenum and tungsten as efficient and versatile catalysts for mild oxidative bromination

Boruah, Jeena Jyoti; Das, Siva Prasad; Borah, Rupam; Gogoi, Sandhya Rani; Islam, Nashreen S.

doi:10.1016/j.poly.2012.09.036

Cited by 42 publications

(28 citation statements)

References 98 publications

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“…We have selected two types of polymer matrices for immobilization of pMo species, viz., amino acid functionalized Merrifield resin (MR) 66 and poly(acrylonitrile) (PAN). 65 PAN was chosen due to its being an insoluble, non-toxic, cost-effective and commercially available reagent. 132 As far as we are aware, the pW immobilized compound PANW reported previously by us, 64 is the only example where PAN has been used as support for immobilization of peroxometal compound 44 despite the well-documented application of acrylonitrile polymers in many areas ranging from medicine to textiles treatment.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…65 The compounds were characterized by elemental analysis, spectral studies (FTIR, 13 C NMR and 95 Mo NMR and diffuse reflectance UV-Vis), SEM, EDX, Brunauer-Emmett-Teller (BET) and TGA-DTG analysis. 66 About 70% of the ligand units have been estimated to be bound to pMo moieties in MRV (60% in MRA).…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…66 In case of the compound PANMo, the pMo moieties are anchored to the polymeric chain through N atom of nitrile groups (figure 10c). 65 …”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…We have generated a series of polymer-bound complexes by anchoring peroxo species of V(V), Mo(VI) or W(VI) to pendant functional groups of WSPs, 61-63 as well as insoluble polymer resins. [64][65][66] Interestingly, the soluble macrocomplexes exhibited unique oxidant activity as well as biochemical properties including anti-bacterial 61 and enzyme inhibitory activities. 62,63 Significantly, immobilization of the pV and pMo species enhanced their stability as well as their ability to resist degradation under the effect of the enzyme catalase.…”

Section: Introductionmentioning

confidence: 99%

“…10 Furthermore, a set of new heterogeneous catalysts have been developed by immobilization of pMo species on insoluble polymer supports viz., amino acid functionalized Merrifield resins 66 and poly(acrylonitrile). 65 The catalysts exhibit excellent activity, stability and selectivity for oxidation of thioethers and dibenzothiophene (DBT) to the corresponding sulfoxides by 30% H 2 O 2 , one of the most sustainable oxidant, at ambient temperature. 66 In addition, a pair of pMo and pW compounds supported on poly(acrylonitrile) matrix heterogeneously catalyzed oxidative bromination of range of activated aromatic substrates with H 2 O 2 65 under ecologically acceptable reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

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Macromolecular peroxo complexes of Vanadium(V) and Molybdenum(VI): Catalytic activities and biochemical relevance

Islam

Boruah

2015

J Chem Sci

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Our recent achievements concerning the synthesis and characterization of water soluble peroxo complexes of V(V) and Mo(VI) in macroligand environment, as well as some key features of biological relevance of these compounds, such as their hydrolytic stability, activity with phosphohydrolase enzyme vis-à-vis free peroxovanadium (pV) or peroxomolybdenum (pMo) complexes, and their activity in biomimetic oxidative bromination are presented here. Immobilization of pMo species on insoluble polymer matrices viz., amino acid functionalized Merrifield resins and poly(acrylonitrile) on the other hand, afforded a set of heterogeneous catalysts highly effective in facile organic transformations such as selective oxidation of organic sulfides and oxidative bromination of aromatic substrates by H 2 O 2 , at ambient temperature. The methodologies are straightforward, high-yielding, halogen-free and the catalysts afford easy regeneration. Our findings illustrate the various features which make the procedures sustainable and synthetically useful.

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Section: Synthesis and Characterizationmentioning

confidence: 99%

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…66 In case of the compound PANMo, the pMo moieties are anchored to the polymeric chain through N atom of nitrile groups (figure 10c). 65 …”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Macromolecular peroxo complexes of Vanadium(V) and Molybdenum(VI): Catalytic activities and biochemical relevance

Islam

Boruah

2015

J Chem Sci

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Functional Enzyme Mimics for Oxidative Halogenation Reactions that Combat Biofilm Formation

et al. 2018

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Transition-metal oxide nanoparticles and molecular coordination compounds are highlighted as functional mimics of halogenating enzymes. These enzymes are involved in halometabolite biosynthesis. Their activity is based upon the formation of hypohalous acids from halides and hydrogen peroxide or oxygen, which form bioactive secondary metabolites of microbial origin with strong antibacterial and antifungal activities in follow-up reactions. Therefore, enzyme mimics and halogenating enzymes may be valuable tools to combat biofilm formation. Here, halogenating enzyme models are briefly described, enzyme mimics are classified according to their catalytic functions, and current knowledge about the settlement chemistry and adhesion of fouling organisms is summarized. Enzyme mimics with the highest potential are showcased. They may find application in antifouling coatings, indoor and outdoor paints, polymer membranes for water desalination, or in aquacultures, but also on surfaces for food packaging, door handles, hand rails, push buttons, keyboards, and other elements made of plastic where biofilms are present. The use of natural compounds, formed in situ with nontoxic and abundant metal oxide enzyme mimics, represents a novel and efficient "green" strategy to emulate and utilize a natural defense system for preventing bacterial colonization and biofilm growth.

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cis‐Dioxomolybdenum(VI) complexes with unsymmetric linear tetradentate ligands: syntheses, structures and bromoperoxidase activities

Kurapati

Pal

2015

Applied Organom Chemis

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C-DEPT NMR) and electrochemical measurements. The molecular structures of 1-4 have been determined using single-crystal X-ray crystallography. In each of 1-4, the ONNO-donor 6,5,5-membered fused chelate rings forming (L n ) 2À and the two mutually cis oxo groups assemble a distorted octahedral N 2 O 4 coordination sphere around the metal centre. In the crystal lattice, each of 1-4 forms a one-dimensional infinite chain structure via intermolecular N-HÁÁÁO hydrogen bonding interactions. In cyclic voltammograms, the diamagnetic complexes display an irreversible metal-centred reduction in the potential range À0.73 to À0.88 V (vs Ag/AgCl). The physicochemical data are consistent with a very similar gross molecular structure for all of 1-5. All the complexes exhibit decent bromoperoxidase activities and are also able to effectively catalyse benzoin and methyl(phenyl)sulfide oxidation reactions.

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Polymer-anchored peroxo compounds of molybdenum and tungsten as efficient and versatile catalysts for mild oxidative bromination

Cited by 42 publications

References 98 publications

Macromolecular peroxo complexes of Vanadium(V) and Molybdenum(VI): Catalytic activities and biochemical relevance

Macromolecular peroxo complexes of Vanadium(V) and Molybdenum(VI): Catalytic activities and biochemical relevance

Functional Enzyme Mimics for Oxidative Halogenation Reactions that Combat Biofilm Formation

cis‐Dioxomolybdenum(VI) complexes with unsymmetric linear tetradentate ligands: syntheses, structures and bromoperoxidase activities

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