Structure, morphology and electronic properties ofl-phenylalanine edge-functionalized graphite platelets through Friedel–Crafts acylation reaction

RSC Advances ◽  
2014 ◽  
Vol 4 (104) ◽  
pp. 60052-60057 ◽  
Author(s):  
Amir Abdolmaleki ◽  
Shadpour Mallakpour ◽  
Sedigheh Borandeh
Keyword(s):  
Electron Transfer ◽  
Electronic Properties ◽  
Acylation Reaction ◽  
Polar Solvents ◽  
Structure Morphology ◽  
Transfer Capability

Edge functionalized graphite were prepared by Friedel–Crafts acylation withl-phenylalanine. The functionalized nanoplatelates are highly dispersible in polar solvents and shows enhanced electron transfer capability compared to pristine graphite.

Deformation of polyiodides in Cs2I8 crystals at high pressure

2021 ◽  
Vol 77 (6) ◽  
Author(s):  
Tomasz Poreba ◽  
Gaston Garbarino ◽  
Davide Comboni ◽  
Mohamed Mezouar
Keyword(s):  
High Pressure ◽  
Electron Transfer ◽  
Bulk Modulus ◽  
Electronic Properties ◽  
Supramolecular Architecture ◽  
Ambient Conditions ◽  
Electron Transfer Mechanism ◽  
Covalently Bonded ◽  
Potential Sources ◽  
High Bulk

Dicaesium octaiodide is composed of layers of zigzag polyiodide units (I8 2−) intercalated with caesium cations. Each I8 2− unit is built of two triiodides bridged with one diiodine molecules. This system was subjected to compression up to 5.9 GPa under hydrostatic conditions. Pressure alters the supramolecular architecture around I8 2−, leading to bending of the triiodide units away from their energetically preferred geometry (D ∞h). Short I2...I3 − contacts compress significantly, reaching lengths typical for the covalently bonded polyiodides. Unlike in reported structures at ambient conditions, pressure-induced catenation proceeds without symmetrization of the polyiodides, pointing to a different electron-transfer mechanism. The structure is shown to be half as compressible [B0 = 12.9 (4) GPa] than the similar CsI3 structure. The high bulk modulus is associated with higher I—I connectivity and a more compact cationic net, than in CsI3. The small discontinuity in the compressibility trend around 3 GPa suggests formation of more covalent I—I bonds. The potential sources of this discontinuity and its implication on the electronic properties of Cs2I8 are discussed.

Theoretical insight into the substituent effects on the antioxidant properties of 8-hydroxyquinoline derivatives in gas phase and in polar solvents

2018 ◽  
Vol 96 (5) ◽  
pp. 453-458
Author(s):  
Anes El-Hadj Saïd ◽  
Sidi Mohamed Mekelleche ◽  
Taki-Eddine Ahmed Ardjani
Keyword(s):  
Electron Transfer ◽  
Gas Phase ◽  
Antioxidant Properties ◽  
Substituent Effects ◽  
Hydrogen Atom Transfer ◽  
Polar Solvents ◽  
Antioxidant Power ◽  
Theoretical Insight ◽  
Insight Into

The objective of this work is to perform a theoretical analysis of the antioxidant properties of a series of 8-hydroxyquinolines (8-HQs) to rationalize the available experimental results and to design new potent 8-HQ derivatives. The study was carried out in gas phase and in methanol at the DFT/B3LYP/ 6-311++G(d,p) computational level. The formation of stable ArO• radicals is discussed on the basis of different mechanisms, namely, hydrogen atom transfer (HAT), single electron transfer followed by proton transfer (SET-PT), and single proton loss electron transfer (SPLET). The obtained results show that the HAT mechanism is, thermodynamically, more favoured in gas phase, whereas the SPLET pathway is more favoured in polar solvents. The calculated thermochemical descriptors allow classification of the antioxidant power of the studied compounds.

scholarly journals Preparation and Characterization of Montmorillonite/PEDOT-PSS and Diatomite/PEDOT-PSS Hybrid Materials. Study of Electrochemical Properties in Acid Medium

2020 ◽  
Vol 4 (2) ◽  
pp. 51 ◽  
Author(s):  
Mohamed Kiari ◽  
Raúl Berenguer ◽  
Francisco Montilla ◽  
Emilia Morallón
Keyword(s):  
Electron Transfer ◽  
Electrochemical Properties ◽  
Hybrid Materials ◽  
Environmental Remediation ◽  
Electroactive Material ◽  
Physico Chemical ◽  
Emerging Pollutant ◽  
Transfer Capability ◽  
Potential Applications ◽  
Concentration Sensitivity

The hybridization of clay minerals with conducting polymers receives great interest for different potential applications, including environmental remediation. This work studies and compares the electrochemical properties of two different clays, montmorillonite (Mont) and diatomite (Diat), and their respective clay/PEDOT-PSS hybrid materials in H2SO4 medium. The hybrid materials were prepared by electropolymerization of EDOT in the presence of PSS. The physico-chemical and electrochemical properties of both clays were analyzed by different techniques, and the influence of the clay properties on electropolymerization and the electroactivity of the resulting clay/PEDOT-PSS hybrids was investigated. Specifically, the Fe2+/Fe3+ redox probe and the oxidation of diclofenac, as a model pharmaceutical emerging pollutant, were used to test the electron transfer capability and oxidative response, respectively, of the clay/PEDOT-PSS hybrids. The results demonstrate that, despite its low electrical conductivity, the Mont is an electroactive material itself with good electron-transfer capability. Conversely, the Diat shows no electroactivity. The hybridization with PEDOT generally enhances the electroactivity of the clays, but the clay properties affect the electropolymerization efficiency and hybrids electroactivity, so the Mont/PEDOT displays improved electrochemical properties. It is demonstrated that clay/PEDOT-PSS hybrids exhibit diclofenac oxidation capability and diclofenac concentration sensitivity.

Free electron transfer from several phenols to radical cations of non-polar solvents

2000 ◽  
Vol 2 (21) ◽  
pp. 4947-4955 ◽  
Author(s):  
Mahalaxmi R. Ganapathi ◽  
Ralf Hermann ◽  
Sergei Naumov ◽  
Ortwin Brede
Keyword(s):  
Electron Transfer ◽  
Free Electron ◽  
Radical Cations ◽  
Polar Solvents

The role of solvent polarity in the electronic properties, stability and reactivity trend of a tryptophane/Pd doped SWCNT novel nanobiosensor from polar protic to non-polar solvents

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 64818-64825 ◽  
Author(s):  
Mehdi Yoosefian ◽  
Nazanin Etminan
Keyword(s):  
Carbon Nanotubes ◽  
Amino Acids ◽  
Electronic Properties ◽  
Solvent Polarity ◽  
High Potential ◽  
Polar Solvents ◽  
Recognition Elements ◽  
Role Of Solvent

Carbon nanotubes and amino acids have a high potential to offer specific advantages as the transducer and the recognition elements of biosensors.

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