Synthesis, characterization, reactivity and antibacterial activity of new peroxovanadium(V) complexes anchored to soluble polymers

Kalita, Diganta; Sarmah, Swapnalee; Das, Siva Prasad; Baishya, Diganta; Patowary, Ashok; Baruah, Sashi; Islam, Nashreen S.

doi:10.1016/j.reactfunctpolym.2007.12.008

Cited by 42 publications

(51 citation statements)

References 57 publications

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“…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. 61,62 Most notable finding of our study was that the polymer anchored and neat peroxo compounds induced their inhibitory effects on ALP via distinct mechanisms. 62,63 Moreover, polymer bound pV 61 and pW complexes 65 efficiently mediated oxidative bromination of organic substrates under mild condition at near neutral pH, considered as essential requirement of a biomimetic model.…”

Section: Introductionmentioning

confidence: 69%

“…61,62 Most notable finding of our study was that the polymer anchored and neat peroxo compounds induced their inhibitory effects on ALP via distinct mechanisms. 62,63 Moreover, polymer bound pV 61 and pW complexes 65 efficiently mediated oxidative bromination of organic substrates under mild condition at near neutral pH, considered as essential requirement of a biomimetic model. It was observed that even a minor change in co-ordination environment around the peroxometal moieties in the polymeric complexes could alter their bioactivity as well as their catalytic activity tremendously.…”

Section: Introductionmentioning

confidence: 69%

“…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%

“…It was observed that even a minor change in co-ordination environment around the peroxometal moieties in the polymeric complexes could alter their bioactivity as well as their catalytic activity tremendously. 61 In view of these interesting findings, anchoring of peroxometallates to WSPs has recently been recognized as a promising new field. 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).…”

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: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Islam

Boruah

2015

J Chem Sci

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“…New peroxovanadate complexes anchored to [64]. Carboxylate groups of polymer chains are able to coordinate to V(V) centers.…”

Section: Haloperoxidationsmentioning

confidence: 99%

Recent advances in vanadium catalyzed oxygen transfer reactions

Licini

Conte

Coletti

et al. 2011

Coordination Chemistry Reviews

159

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Vanadium complexes have proven to be effective catalysts for the activation of peroxides and the selective oxidation of substrates like bromides, sulfides and alkenes. Besides their capability to form metalloperoxo species, which effectively transfer oxygen atoms to the substrate, these systems are synthetically useful for obtaining valuable oxidized molecules on a preparative scale, with a high degree of selectivity and TONs. Furthermore, the use of environmentally friendly oxidants like hydrogen and alkyl hydroperoxides increases significantly their potential application at an industrial level. Here we report a critical survey on the most effective homogeneous vanadium catalysts reported in the last decade concerning their synthetic application in oxygen transfer reactions (sulfoxidation, epoxidation, haloperoxidation) using hydrogen peroxide or alkyl hydroperoxides, demonstrating the different classes of ligands and complexes, their catalytic performances, their reactivity, chemo, stereo and substrate selectivity. Some examples of the use of non conventional reaction media or techniques and catalyst recycling studies will be also discussed

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Diperoxo Complexes of Vanadium(V) Containing Mannich Base Ligands

et al. 2011

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The vanadium(V) peroxo complexes containing Mannich base ligands having composition Na[VO(O 2 ) 2 (L-L)]•H 2 O [where L-L＝morpholinobenzyl acetamide (MBA), piperidinobenzyl acetamide (PBA), morpholinobenzyl benzamide (MBB), piperidinobenzyl benzamide (PBB), morpholinomethyl benzamide (MMB), piperidinomethyl benzamide (PMB), morpholinobenzyl formamide (MBF), piperdinobenzyl formamide (PBF)] have been reported. The complexes have been prepared by stirring vanadium pentoxide with excess of 30% aqueous-H 2 O 2 followed by treatment with ethanolic solution of the ligand and finally maintained the pH of the reaction mixture by adding dilute solution of sodium hydroxide. The synthesized complexes have been characterized by various physico-chemical techniques, via elemental analysis, molar conductivity, magnetic susceptibility measurements, infra red, electronic, mass, 1 H NMR spectral and TGA/DTA studies. These studies revealed that the synthesized complexes are uni-univalent electrolytes and diamagnetic in nature. The ligands are bound to metal in a bidentate mode through carbonyl oxygen and the ring nitrogen. Thermal analysis result provides conclusive evidence for the presence of one molecule of lattice water in the complexes. Mass spectra confirm the molecular mass of the complexes.

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Synthesis, characterization, reactivity and antibacterial activity of new peroxovanadium(V) complexes anchored to soluble polymers

Cited by 42 publications

References 57 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

Recent advances in vanadium catalyzed oxygen transfer reactions

Diperoxo Complexes of Vanadium(V) Containing Mannich Base Ligands

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