Novel Mn(III) heterochelates: synthesis, thermal, spectroscopic, and coordination aspects

Modi, Chetan K.; Jani, Darshan H.

doi:10.1007/s10973-010-0890-x

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…The sharp and strong band is observed at 1623 and 1633 cm −1 due to ν(C=N) of azomethine group of the H 2 L 1 and H 2 L 2 ligands, respectively. This band is appeared at ~1614-1627 cm −1 in the spectra of neat complexes and at ~1627-1644 cm −1 in the spectra of encapsulated complexes that suggests the coordination of azomethine nitrogen to the metal center [17]. The phenolic -OH vibration of the Schiff base ligands H 2 L 1 (3422 cm −1 ) and H 2 L 2 (3354 cm −1 ) disappeared in that of the neat complexes, indicating the involvement of this group in coordination with the metal ion, via de-protonation.…”

Section: Characterization Of the Catalystsmentioning

confidence: 96%

Mn(II) and VO(IV) Schiff base complexes encapsulated in nanocavities of zeolite-Y: catalytic activity toward oxidation of alkenes and reduction of aldehydes

2016

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base ligands are well known to mimic the catalytic cycle of cytochrome P-450 and have attracted research interest in recent years [3,4]. Encapsulated metallomacrocycles in the nanopores of zeolite-Y combine the advantages of homo-and heterocatalytic systems. These nanocomposite materials have been extensively used as biomimetic heterogeneous catalysts for oxidation reactions with a variety of oxidants [5][6][7][8] and reduction reactions with sodium borohydride [9][10][11][12][13].We have developed many catalytic systems using transition metal complexes of Schiff base ligands for various oxidative chemical transformations [5,[14][15][16]. In comparison with the application of transition metal Schiff base complexes as oxidative catalysts, their ability to reduction reactions has received considerably less attention in organic synthesis [12,13]. As an ongoing effort to emphasize the role of transition metal complexes of Schiff base ligands as reduction-promoting catalysts, herein, we report an efficient reduction of different aldehydes using NaBH 4 and also heterogeneous oxidation of different alkenes with H 2 O 2 in the presence of a oxovanadium(IV) and manganese(II) Schiff base complexes encapsulated in the nanocavities of zeolite-Y. Experimental Materials(2,4-Dihydroxyacetophenone),1,2-diaminopropane, ethylenediamine, zeolite-Y (Na 52 [(AlO 2 ) 52 (SiO 2 ) 140 ]), hydrogen peroxide (30 %) and sodium borohydride were obtained from Merck. Other materials were of commercial reagent grade and were purchased from Sigma-Aldrich or FLUKA companies and treated when necessary.Abstract Oxovanadium(IV) and manganese(II) complexes of two Schiff base ligands, bis(2,4-dihydroxyacetophenone)-1,2-propandiimine (H 2 L 1 ) and bis(2,4-dihydroxyacetophenone)-ethylenediimine (H 2 L 2 ) were synthesized and characterized. The encapsulation of these complexes in the nanocavities of zeolite-Y was achieved by a flexible ligand method. The prepared heterogeneous catalysts have been characterized by FTIR, NMR and atomic absorption spectroscopy, X-ray diffraction patterns, scanning electron microscopy and BET. The catalytic activities of the encapsulated complexes were studied in the oxidation of alkenes with H 2 O 2 and the reduction of aldehydes with NaBH 4 . In most cases, the manganese (II) complexes (MnL 1 -Y, MnL 2 -Y) showed better activity than the oxovanadium (IV) complexes (VOL 1 -Y, VOL 2 -Y) in both oxidation of alkenes and reduction of aldehydes. The catalytic activity of the recovered catalysts was compared with the fresh ones.

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Section: Characterization Of the Catalystsmentioning

confidence: 96%

Mn(II) and VO(IV) Schiff base complexes encapsulated in nanocavities of zeolite-Y: catalytic activity toward oxidation of alkenes and reduction of aldehydes

2016

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“…The major decomposition (T peak ¼458 1C) occurs due to the degradation of the ligand (observed 46.8%, calculated 46.56%) and the curve at this stage is seen to be steep. This is followed by a gradual mass loss leaving behind manganese oxide and carbon residue (observed 42.25%, calculated 42.68%) as the final products [23][24][25].…”

Section: Thermal Studiesmentioning

confidence: 99%

Growth and characterisation of a novel polymer of manganese(II) nicotinate single crystal

Prasanna¹,

Bijini²,

Babu³

et al. 2011

Journal of Crystal Growth

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Mn(III) mixed‐ligand complexes with bis‐pyrazolones and ciprofloxacin drug: synthesis, characterization and antibacterial activities

Modi

Jani

2011

Applied Organom Chemis

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Novel Mn(III) heterochelates: synthesis, thermal, spectroscopic, and coordination aspects

Cited by 8 publications

References 31 publications

Mn(II) and VO(IV) Schiff base complexes encapsulated in nanocavities of zeolite-Y: catalytic activity toward oxidation of alkenes and reduction of aldehydes

Mn(II) and VO(IV) Schiff base complexes encapsulated in nanocavities of zeolite-Y: catalytic activity toward oxidation of alkenes and reduction of aldehydes

Growth and characterisation of a novel polymer of manganese(II) nicotinate single crystal

Mn(III) mixed‐ligand complexes with bis‐pyrazolones and ciprofloxacin drug: synthesis, characterization and antibacterial activities

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