Immobilization of cobalt(III) Schiff base complexes onto Montmorillonite-K10: Synthesis, experimental and theoretical structural determination

Kianfar, Ali Hossein; Mahmood, Wan Ahmad Kamil; Dinari, Mohammad; Farrokhpour, Hossein; Enteshari, Majid; Azarian, Mohammad Hossein

doi:10.1016/j.saa.2014.10.051

Cited by 19 publications

(17 citation statements)

References 42 publications

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“…2, it can be seen that the electronic spectrum shows a strong characteristic band (230 to 260 nm) and, a weak band (340 nm)-B band (soret band) below the region of 400 nm, which might be attributed to the π→π* transition of C=C bonds available in aromatic rings [17]. According to the literature, the band at 400 nm involving π→π* transition is related to the azomethine group in the Schiff base ligand [18]. These bands of tested catalyst sample with small shift in wavelength in this work may be due to the chemical modification of Schiff base after the metallation with metal ions.…”

Section: Resultsmentioning

confidence: 90%

Synergistic electrocatalysis of N,Nʹ-bis(salicylidene)-ethylenediamine-cobalt(II) and conductive carbon black (BP) for high efficient CO2 electroreduction

Liu

et al. 2015

J Solid State Electrochem

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Gas diffusion electrodes (GDEs) modified with N, N -Bis(salicylidene)-ethylenediamine-cobalt(II) (Cosalen) and conductive carbon black (BP) have been prepared. It is demonstrated that modified BP-Cosalen/GDE electrode is able to catalyze CO 2 reduction in a more efficient and selective manner than that of bulk Cosalen/GDE in 0.5 M KHCO 3 solution. In the presence of 60 wt% of BP, the as-prepared BPCosalen/GDE electrode exhibits the highest activity for catalyzing CO 2 reduction reaction, wherever increase or decrease the amount of BP do not benefit to CO 2 reduction. Compared to other BP-Cosalen/GDE electrodes, the BP-Cosalen/GDE60 shows the most positive onset potential, and the maximum current density reaches 21 mA cm −2 . The improved catalytic activity is largely due to the excellent electrical conductivity and the developed pore structure of BP which provides more active phases for the electrochemical reduction of CO 2 . Further analysis of reduction product reveals that the product on BP-Cosalen/GDE60 electrode is formate in 0.5 M KHCO 3 electrolyte. The highest faradaic efficiency reached 27 % along with the production rate of formate as much as 0.44 mM.

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Section: Resultsmentioning

confidence: 90%

Synergistic electrocatalysis of N,Nʹ-bis(salicylidene)-ethylenediamine-cobalt(II) and conductive carbon black (BP) for high efficient CO2 electroreduction

Liu

et al. 2015

J Solid State Electrochem

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“…The peaks of montmorillonite appearing at 1644 cm −1 and 3416 cm −1 are related to the OH bending. The peaks at 1018 cm −1 and 3620 cm −1 are assigned to Si-O and Al-O-H, respectively (Kianfar et al, 2014a(Kianfar et al, , 2014bVaradwaj et al, 2011). Fig.…”

Section: Resultsmentioning

confidence: 95%

“…Various kinds of supports have been reported, including alumina (Chary et al, 2003), modified polystyrene (Gupta & Sutar, 2008b), zeolites (Chidambaram et al, 2006), silica (SalavatiNiasari et al, 2007b) and montmorillonite (Cao et al, 2014;Kameyama et al, 2006;Li et al, 2013). Among these, montmorillonite, has been extensively investigated in recent years due to its large effective surface area, economic feasibility and low toxicity (Kianfar et al, 2014a). In addition, it can render it possible for oxidation reactions to be performed on an industrial scale using montmorillonite as support (Masui et al, 2014;Parida et al, 2011;Salavati-Niasari, 2007).…”

Section: Introductionmentioning

confidence: 99%

Carbonylation of cyclohexene to 2-cyclohexene-1-one by montmorillonite-supported Co(II) catalysts

2015

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A novel environmentally-friendly catalytic system for the carbonylation of cyclohexene with molecular oxygen under conditions of mild temperature, and under an atmospheric oxygen pressure is presented. In this system, a series of readily-prepared cobalt complexes of 2-aminophenol and its derivatives immobilised onto montmorillonite were used as catalysts. The catalysts were characterised by FT-IR, elemental analysis, thermogravimetric analysis, powder X-ray diffraction, diffuse reflectance ultraviolet visible spectra, scanning electron microscopic measurements, transmission electron microscopic measurements and the Brunauer-Emmett-Teller method. The effects of various reaction conditions such as catalyst dosage, temperature and time were optimised, obtaining an 88.7 % conversion with 72.0 % selectivity of 2-cyclohexene-1-one in 6 h. The results show that the catalytic activity of the cobalt complexes encapsulated in montmorillonite is higher than those of the free complexes. In addition, the heterogeneous catalysts were stable and can be recycled up to five times without any noticeable change in the catalytic activity.

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“…It is clear that coordination leads to the redistribution of electron density, especially in the triazole ring moieties coordinated with Zn(II). The transferred charges decrease the polarization . The average negative charges of the triazole ring in complexes 1 ‐ 4 (

\sum^{-}

1 = ‐0.021e,

\sum^{-}

2 = ‐0.109e,

\sum^{-}

3 = ‐0.082e, and

\sum^{-}

4 = ‐0.089e) are much smaller than that in L (∑ L = ‐0.256e).…”

Section: Resultsmentioning

confidence: 99%

Enhanced antifungal activities of four Zn(II) complexes based on uniconazole

Ren

Zhou

et al. 2017

Applied Organom Chemis

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Four Zn(II) complexes, [ZnL2(SO4)]n (1), [ZnL4(H2O)2]•2(NO3)•4EtOH (2), [ZnL2Cl2]•L (3), and [ZnL2Br2]•L (4) (L = uniconazole), were synthesized using a hydrothermal method and characterized by elemental analysis, FT‐IR spectroscopy, and single‐crystal XRD. Complex 1 formed a one‐dimensional polymer chain. However, complexes 2‐4 were obtained as zero‐dimensional mononuclear coordination compounds. The antifungal activities of these complexes were then evaluated against four selected fungi using the mycelial growth rate method. The resulting data indicate that all complexes show better antifungal activities than their ligands and mixtures. In addition, the interactions between the metal salts of complexes 1‐4 and uniconazole seem to be synergistic. Furthermore, the polymer chain structure of complex 1 significantly enhanced the bioactivity, especially against Botryosphaeria ribis (I). Density functional theory (DFT) calculations were carried out to help explain the enhanced bioactivity after the formation of Zn(II) complexes. The resulting data show that the HOMO–LUMO energy gaps of complexes 1‐4 (0.0578, 0.0946, 0.1053, and 0.1245 eV) are smaller than that of the free ligand (0.1247 eV) and correlate with the antifungal activity of the zinc complexes.

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Immobilization of cobalt(III) Schiff base complexes onto Montmorillonite-K10: Synthesis, experimental and theoretical structural determination

Cited by 19 publications

References 42 publications

Synergistic electrocatalysis of N,Nʹ-bis(salicylidene)-ethylenediamine-cobalt(II) and conductive carbon black (BP) for high efficient CO2 electroreduction

Synergistic electrocatalysis of N,Nʹ-bis(salicylidene)-ethylenediamine-cobalt(II) and conductive carbon black (BP) for high efficient CO2 electroreduction

Carbonylation of cyclohexene to 2-cyclohexene-1-one by montmorillonite-supported Co(II) catalysts

Enhanced antifungal activities of four Zn(II) complexes based on uniconazole

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