Synthesis, characterisation and catalytic activities of manganese(III) complexes of pyridoxal-based ONNO donor tetradenatate ligands

Maurya, Mannar R.; Saini, Priyanka; Haldar, Chanchal; Avecilla, Fernando

doi:10.1016/j.poly.2011.10.029

Cited by 34 publications

(15 citation statements)

References 43 publications

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“…Therefore, the catalytic efficiency of synthesized catalysts, PS‐[V V O 2 (Haeae‐sal)] ( 5 ) and PS‐[V V O 2 (Haeae‐hyap)] ( 6 ), was evaluated for the oxidation of thioanisole. Sulfone and sulfoxide were identified as two major products (shown in scheme ) for this reaction which are well reported in the literature …”

Section: Catalytic Activity Studiessupporting

confidence: 78%

Synthesis and characterization of dimeric μ‐oxidovanadium complexes as the functional model of vanadium bromoperoxidase

Maurya

Mahato

Chaudhary

et al. 2020

Applied Organom Chemis

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Two vanadium (IV) complexes [VIVO(Haeae‐sal)(MeOH)]+ (1) and [VIVO(Haeae‐hyap)(MeOH)]+ (2) were prepared by reacting [VO(acac)2] with ligands [H2aeae‐sal] (I) and [H2aeae‐hyap] (II) respectively. Condensation of 2‐(2‐aminoethylamino)ethanol with salicylaldehyde and 2‐hydroxyacetophenone produces the ligands (I) and (II) respectively. Both vanadium complexes 1 and 2 are sensitive towards aerial oxygen in solution and rapidly convert into vanadium(V) dioxido species. Vanadium(V) dioxido species crystalizes as the dimeric form in the solid‐state. Single‐crystal XRD analysis suggests octahedral geometry around each vanadium center in the solid‐state. To access the benefits of heterogeneous catalysis, vanadium(V) dioxido complexes were anchored into the polymeric chain of chloromethylated polystyrene. All the synthesized neat and supported vanadium complexes have been studied by a number of techniques to confirm their structural and functional properties. Bromoperoxidase activity of the synthesized vanadium(V) dioxido complexes 3 and 4 was examined by carrying out oxidative bromination of salicylaldehyde and oxidation of thioanisole. In the presence of hydrogen peroxide, 3 shows 94.4% conversion (TOF value of 2.739 × 102 h−1) and 4 exhibits 79.0% conversion (TOF value of 2.403 × 102 h−1) for the oxidative bromination of salicylaldehyde where 5‐bromosalicylaldehyde appears as the major product. Catalysts 3 and 4 also efficiently catalyze the oxidation of thioanisole in the presence of hydrogen peroxide where sulfoxide is observed as the major product. Covalent attachment of neat catalysts 3 and 4 into the polymer chain enhances substrate conversion (%) and their catalytic efficiency increases many folds, both in the oxidative bromination and oxidation of thioether. Polymer supported catalysts 5 displayed 98.8% conversion with a TOF value of 1.127 × 104 h−1 whereas catalyst 6 showed 95.7% conversion with a TOF value of 4.675 × 103 h−1 for the oxidative bromination of salicylaldehyde. These TOF values are the highest among the supported vanadium catalysts available in the literature for the oxidative bromination of salicylaldehyde.

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Section: Catalytic Activity Studiessupporting

confidence: 78%

Synthesis and characterization of dimeric μ‐oxidovanadium complexes as the functional model of vanadium bromoperoxidase

Maurya

Mahato

Chaudhary

et al. 2020

Applied Organom Chemis

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“…Nowadays, zeolite materials in which transition metal complexes have been encapsulated into the aluminosilicate framework have been of considerable interest due to its wide applications in catalysis as heterogeneous catalysts. [1][2][3][4][5][6][7] By this way it is possible to perform catalytic reactions combining the advantages of homogeneous and heterogeneous catalytic system. [8] On the other hand, incorporation of metal complexes inside the zeolite enhances the chemical and thermal stability of the occluded complexes owing to the zeolite shielding.…”

Section: Introductionmentioning

confidence: 99%

“…Literature survey in this trend referred to the encapsulation of different types of ligands, such as porphyrins, phthalocyanines, Schiff bases, (poly) pyridines, amidate, and polyaza macrocyclic models, and in addition we have recently published iron(II, III) complexes of hydrazone. [4][5][6][7][14][15][16][17][18] Semicarbazones are discriminating hydrazones attracted the attention of chemists because of their medicinal and analytical importance. They are versatile ligands, bearing suitable donor atoms for coordination with metals.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Studies and Heterogeneous Hydroxylation of Benzene on Fe^II, Fe^III-Semicarbazone/Zeolite-Y Clathrates

Ahmed

Thabet

2015

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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Complexes of Fe(II) and Fe(III) with semicarbazone (SALSC) derived from salicylaldehyde and semicarbazide hydrochloride have been trapped in zeolite-Y super cages using "ship-in-a-bottle technique." The synthesized new clathrates have been structurally characterized by various physicochemical techniques, in addition to surface area and nitrogen adsorption studies. The Fe(II) and Fe (III) ions inside zeolite-Y are coordinated with SALSC ligand via the (CDN), phenolic (OH), and deprotonated enolized (CDO) groups forming mononuclear structures. The results pointed out that the lattice oxygen zeolite was involved in coordination and the intrazeolitic ferrous and ferric semicarbazone complexes have prevailing octahedral configurations with noticeable high thermal stability. The catalytic activity of the new hybrid materials was checked for hydroxylation of benzene at 80 C using H 2 O 2 as oxidant to give phenol.

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“…Relatively sharp bands arising in the range of 3273 cm −1 to 3283 cm −1 are assigned to ν (N‐H) . The ν (O‐H) stretch is designated to the bands occurring in the range 3430 cm −1 to 3482 cm −1 …”

Section: Resultsmentioning

confidence: 99%

Polymer‐anchored mononuclear and binuclear Cu^II Schiff‐base complexes: Impact of heterogenization on liquid phase catalytic oxidation of a series of alkenes

Maurya

Kesharwani

Kachhap

et al. 2019

Applied Organom Chemis

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Liquid phase catalytic oxidation of a number of alkenes, for example, cyclohexene, cis‐cyclooctene, styrene, 1‐methyl cyclohexene and 1‐hexene, was performed using polymer‐anchored copper (II) complexes PS‐[Cu (sal‐sch)Cl] (5), PS‐[Cu (sal‐tch)Cl] (6), PS‐[CH2{Cu (sal‐sch)Cl}2] (7) and PS‐[CH2{Cu (sal‐tch)Cl}2] (8). Neat complexes [Cu (sal‐sch)Cl] (1), [Cu (sal‐tch)Cl] (2), [CH2{Cu (sal‐sch)Cl}2] (3) and [CH2{Cu (sal‐tch)Cl}2] (4) were isolated by reacting CuCl2·2H2O with [Hsal‐sch] (I), [Hsal‐tch] (II), [H2bissal‐sch] (III) and [H2bissal‐tch] (IV), respectively, in refluxing methanol. Complexes 1–4 have been covalently anchored in Merrifield resin through the amine nitrogen of the semicarbazide or thiosemicarbazide moiety. A number of analytical, spectroscopic and thermal techniques, such as CHNS analysis, Fourier transform‐infrared, UV–Vis, PMR, 13C‐NMR, electron paramagnetic resonance, scanning electron microscopy, energy‐dispersive X‐ray analysis, thermogravimetric analysis, atomic force microscopy, atomic absorption spectroscopy, and electrospray ionization‐mass spectrometry, were used to analyze and establish the molecular structure of the ligands (I)–(IV) and complexes (1)–(8) in solid state as well as in solution state. Grafted complexes 5–8 were employed as active catalysts for the oxidation of a series of alkenes in the presence of hydrogen peroxide. Copper hydroperoxo species ([CuIII (sal‐sch)‐O‐O‐H]), which is believed to be the active intermediate, generated during the catalytic oxidation of alkenes, are identified. It was found that supported catalysts are very economical, green and efficient in contrast to their neat complexes as well as most of the recently reported heterogeneous catalysts.

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Synthesis, characterisation and catalytic activities of manganese(III) complexes of pyridoxal-based ONNO donor tetradenatate ligands

Cited by 34 publications

References 43 publications

Synthesis and characterization of dimeric μ‐oxidovanadium complexes as the functional model of vanadium bromoperoxidase

Synthesis and characterization of dimeric μ‐oxidovanadium complexes as the functional model of vanadium bromoperoxidase

Physicochemical Studies and Heterogeneous Hydroxylation of Benzene on Fe^II, Fe^III-Semicarbazone/Zeolite-Y Clathrates

Polymer‐anchored mononuclear and binuclear Cu^II Schiff‐base complexes: Impact of heterogenization on liquid phase catalytic oxidation of a series of alkenes

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Synthesis, characterisation and catalytic activities of manganese(III) complexes of pyridoxal-based ONNO donor tetradenatate ligands

Cited by 34 publications

References 43 publications

Synthesis and characterization of dimeric μ‐oxidovanadium complexes as the functional model of vanadium bromoperoxidase

Synthesis and characterization of dimeric μ‐oxidovanadium complexes as the functional model of vanadium bromoperoxidase

Physicochemical Studies and Heterogeneous Hydroxylation of Benzene on FeII, FeIII-Semicarbazone/Zeolite-Y Clathrates

Polymer‐anchored mononuclear and binuclear CuII Schiff‐base complexes: Impact of heterogenization on liquid phase catalytic oxidation of a series of alkenes

Contact Info

Product

Resources

About

Physicochemical Studies and Heterogeneous Hydroxylation of Benzene on Fe^II, Fe^III-Semicarbazone/Zeolite-Y Clathrates

Polymer‐anchored mononuclear and binuclear Cu^II Schiff‐base complexes: Impact of heterogenization on liquid phase catalytic oxidation of a series of alkenes