Pyridine Based Polymers: Synthesis and Characterization

Pardo, M. A.; Pérez, José Miguel Giner; Valle, M. A. del; Godoy, Margarita; Díaz, F. R.

doi:10.4067/s0717-97072014000200014

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…All potentials quoted in this paper are referred to as an Ag/AgCl electrode in tetramethylammonium chloride to match the potential of a saturated calomel electrode (SCE), at room temperature. All electrochemical experiments were performed at room temperature on a CHI900B bipotentiostat interfaced to a PC running the CHI 9.12 software that allowed experimental control and data acquisition, as previously reported for other determinations [ 67 , 68 ].…”

Section: Methodsmentioning

confidence: 99%

Structural Characterization, DFT Calculation, NCI, Scan-Rate Analysis and Antifungal Activity against Botrytis cinerea of (E)-2-{[(2-Aminopyridin-2-yl)imino]-methyl}-4,6-di-tert-butylphenol (Pyridine Schiff Base)

et al. 2020

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Botrytis cinerea is a ubiquitous necrotrophic filamentous fungal phytopathogen that lacks host specificity and can affect more than 1000 different plant species. In this work, we explored L1 [(E)-2-{[(2-aminopyridin-2-yl)imino]-methyl}-4,6-di-tert-butylphenol], a pyridine Schiff base harboring an intramolecular bond (IHB), regarding their antifungal activity against Botrytis cinerea. Moreover, we present a full characterization of the L1 by NMR and powder diffraction, as well as UV–vis, in the presence of previously untested different organic solvents. Complementary time-dependent density functional theory (TD-DFT) calculations were performed, and the noncovalent interaction (NCI) index was determined. Moreover, we obtained a scan-rate study on cyclic voltammetry of L1. Finally, we tested the antifungal activity of L1 against two strains of Botrytis cinerea (B05.10, a standard laboratory strain; and A1, a wild type strains isolated from Chilean blueberries). We found that L1 acts as an efficient antifungal agent against Botrytis cinerea at 26 °C, even better than the commercial antifungal agent fenhexamid. Although the antifungal activity was also observed at 4 °C, the effect was less pronounced. These results show the high versatility of this kind of pyridine Schiff bases in biological applications.

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Section: Methodsmentioning

confidence: 99%

Structural Characterization, DFT Calculation, NCI, Scan-Rate Analysis and Antifungal Activity against Botrytis cinerea of (E)-2-{[(2-Aminopyridin-2-yl)imino]-methyl}-4,6-di-tert-butylphenol (Pyridine Schiff Base)

et al. 2020

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“…S6) indicated the possible oxidative polymerization of pyridine units at positive potentials. 74,75 Under the same battery test conditions, the capacity retention of the monoMebiPy/PEG12-PTZ battery after 250 cycles is 76.6%, indicating a capacity loss of 0.09% per cycle (Fig. 6A, red).…”

Section: Table I Physical and Electrochemical Properties A)mentioning

confidence: 94%

Extending the Redox Potentials of Metal-Free Anolytes: Towards High Energy Density Redox Flow Batteries

Chai

Lashgari

Wang

et al. 2020

J. Electrochem. Soc.

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Non-aqueous organic redox flow batteries (NORFBs) have emerged as a promising technology for renewable energy storage and conversion. High capacity and power density can be achieved by virtue of high solubility and high operating voltage of the organic anolytes and catholytes in organic media. However, the lack of anolyte materials with high redox potentials and their poor electrochemical stability retard the wider application of NORFBs. Here, we investigated an evolutionary design of a set of bipyridines and their analogues as anolytes and examined their performance in full flow batteries. Using combined techniques of repeated voltammetry, lower scan rate cyclic voltammetry, proton nuclear magnetic resonance, and density functional theory calculations, we could rapidly evaluate the redox potential, stability, and reversibility of these redox candidates. The promising candidates, 4-pyridylpyridinium bis(trifluoromethanesulfonyl)imide (monoMebiPy) and 4,4′-bipyridine (4,4′-biPy), were subjected to battery cycling. Extended studies of the post-cycling electrolytes were conducted to analyze the pathway of capacity fading and revealed a reduction-promoted methyl group shift mechanism for monoMebiPy. A family of easily accessible anolyte molecules with high redox stability and redox potentials was discovered that can be applied in NORFBs.

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“…AIE-active C8 molecules with a concentration of 1.2 × 10 −3 M showed a strong and broad absorption peak centered at 363 nm, which is an electronic π-π * transition of the cyclopentadiene ring [23]. The strong absorption bands at λ = 254 nm and λ = 272 nm are associated with electronic π-π * transitions of the pyridinium moiety [24]. Figure 5(b) corresponding to the PVP ethanol solution with a concentration of 4.6 × 10 −4 M showed a featureless absorption throughout the spectral range, while the PVP/C8 mixture resembles the spectrum of C8 in ethanol solution in Figure 5(a).…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

Rapid Fabrication of Photoluminescent Electrospun Nanofibers without the Need of Chemical Polymeric Backbone Modifications

Sobhan

Лебедев

Chng

et al. 2018

Journal of Nanomaterials

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Photoluminescent electrospun nanofibers were fabricated by incorporating a cyclopentadiene derivative AIE-active luminogen within the polymeric matrices of polyvinylpyrrolidone (PVP), poly(vinylidene fluoride)-co-hexafluoropropylene (PVDF-HFP), and poly(methylacrylate) (PMMA) under different solvents. Raman, infrared, and fluorescence spectroscopy showed the molecular integrity of the AIEgen is maintained during the electrospinning process while exhibiting a strong and uniformed phosphorescent radiative pathway of τaverage = 8.9 μs. This method allows for the rapid fabrication of photoluminescent nanofibers into a wide range of polymeric matrices without the need of chemical modifications. Taken together, the prepared electrospun phosphorescent nanofibers are a stepping stone for AIEgens to be applied in the digital manufacturing and design of smart textiles.

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Pyridine Based Polymers: Synthesis and Characterization

Cited by 9 publications

References 14 publications

Structural Characterization, DFT Calculation, NCI, Scan-Rate Analysis and Antifungal Activity against Botrytis cinerea of (E)-2-{[(2-Aminopyridin-2-yl)imino]-methyl}-4,6-di-tert-butylphenol (Pyridine Schiff Base)

Structural Characterization, DFT Calculation, NCI, Scan-Rate Analysis and Antifungal Activity against Botrytis cinerea of (E)-2-{[(2-Aminopyridin-2-yl)imino]-methyl}-4,6-di-tert-butylphenol (Pyridine Schiff Base)

Extending the Redox Potentials of Metal-Free Anolytes: Towards High Energy Density Redox Flow Batteries

Rapid Fabrication of Photoluminescent Electrospun Nanofibers without the Need of Chemical Polymeric Backbone Modifications

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