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Electrochemically Active (electrochemically + active)

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Chemistry80%

Terms modified by Electrochemically Active

  • electrochemically active bacteria
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    Selected Abstracts

    Electrocatalysis and Amperometric Detection of the Reduced Form of Nicotinamide Adenine Dinucleotide at Toluidine Blue/Zinc Oxide Coated Electrodes

    ELECTROANALYSIS, Issue 18 2007
    Ashok Kumar
    Abstract Thin toluidine blue (TBO) and zinc oxide (ZnO) hybrid films have been grown on glassy carbon electrode (GCE) and indium tin oxide coated (SnO2) glass electrodes by using cyclic voltammetry (CV). Scanning electron microscopy (SEM) images revealed spherical and beads-like shape of highly oriented TBO/ZnO hybrid films. Energy dispersive spectrometry (EDS) results declared that the films composed mainly of Zn and O. Moreover, TBO/ZnO hybrid films modified electrode is electrochemically active, dye molecules were not easily leached out from the ZnO matrix and the hybrid films can be considered for potential applications as sensor for amperometric determination of reduced nicotinamide adenine dinucleotide (NADH) at 0.0,V. A linear correlation between electrocatalytic current and NADH concentration was found to be in the range between 25,,M and 100,,M in phosphate buffer. In addition, we observed that dopamine, ascorbic acid and uric acid are not interference in amperometric detection of NADH in this proposed method. In addition, TBO/ZnO hybrid film modified electrode was highly stable and its response to the NADH also remained relentless. [source]

    Redox Active Two-Component Films of Palladium and Covalently Linked Zinc Porphyrin,Fullerene Dyad

    ELECTROANALYSIS, Issue 9 2006
    Marta Plonska
    Abstract Redox active films have been generated electrochemically by the reduction of dyads consisting of fullerene C60 covalently linked to zinc meso -tetraphenyloporphyrin, ZnPC60, and palladium acetate. The films are believed to consist of a polymeric network formed via covalent bonds between the palladium atoms and the fullerene moieties. In these films, the zinc porphyrin moiety is covalently linked to the polymeric chains through the pyrrolidine ring of the fullerene. The ZnPC60/Pt films are electrochemically active in both positive and negative potential excursions. At positive potentials, two oxidation steps for the zinc porphyrin are observed. In the negative potential range, electron transfer processes involving the zinc porphyrin and the fullerene entities are observed. Film formation is also accompanied by palladium deposition on the electrode surface. The presence of a metallic phase in the film influences its morphology, structure and electrochemical properties. [source]

    Synthesis and Light-Emitting Properties of New Polyimides Containing Ethynylene Units in the Main Chain

    MACROMOLECULAR MATERIALS & ENGINEERING, Issue 7 2007
    Jun Ho Chi
    Abstract Two new polyimides (ODA-PI and HDA-PI) having 1,4-phenylenediethynylene unit and octyloxy groups were synthesized. Judging from inherent viscosities of their precursor PAAs (1.42 and 1.62 dL,·,g,1), the two PIs were very high in molecular weight. Casting and thermal imidization of PAAs results polyimides with good-quality films. They were stable up to 364,°C and showed no crystallites. UV-vis and PL spectra in NMP solutions of both PIs showed maxima at 442 and 501 nm, respectively, while PL spectra in ,10 µm thick films exhibited a maximum at 540 nm. CV indicates that two PIs were electrochemically active in redox region. The devices with construction of ITO/PEDOT/PIs/BAlq3/LiF/Al exhibited turn-on voltages of 6.5 V in ODA-PI and 7.5 V in HDA-PI and emitted a bright bluish-green light. ODA-PI and HDA-PI showed maximum luminescence of 256 and 316 cd,·,cm,2, respectively, at the same voltage of 12 V. [source]

    Structural and Nonlinear Optical Properties of Aligned Heterotrinuclear [RuII -(Spacer)-MII -(Spacer)-RuII] Complexes (M=Pd, Pt; spacer=4-ethynylpyridine)

    CHEMISTRY - AN ASIAN JOURNAL, Issue 6 2009
    Qingchun Ge
    Abstract Optical alloy: "Linear" heterotrinuclear assemblies, with the metals separated by 4-ethynylpyridine spacers [RuCp(CCpy-4)(dppf)]2[MCl2] (M=Pd, Pt), have been structurally identified. They are electrochemically active and show good cubic nonlinear optical responses. Lewis addition between the metalloligand [RuCp(CCpy-4)(dppf)] (1) (dppf=(C5H4PPh2)2Fe) and MCl2(CH3CN)2 gives [RuCp(CCpy-4)(dppf)]2[MCl2] (M=Pd (2) and Pt (3)), all of which have been spectroscopically and crystallographically characterized. The mixed-metal adducts show the d6 -d8 -d6 metal alignment maintained by the trans disposition of the directionally rigid 4-ethynylpyridine at the centrosymmetric square-planar metal center. Electrochemical studies of these and the related known complexes trans -[RuCl(CCpy-4)(dppm)2] (4) and [trans -RuCl(CCpy-4)(dppm)2]2[MCl2] (dppm=Ph2PCH2PPh2) (M=Pd (5) and Pt (6)) suggest that the spacer-linked heterotrinuclear network is able to stabilize the oxidized RuIII better than the metalloligand precursor. Cubic nonlinear optical responses are also generally higher for the heterometallic complexes. The ,real value of the PdRu2 dppm complex 5 is among the largest for linear organometallic complexes. [source]

    Convergent/Divergent Synthesis and Photophysical Studies of Alternating Benzene,Furan Oligoaryls from Substituted Propargylic Dithioacetals

    CHEMISTRY - AN ASIAN JOURNAL, Issue 1-2 2006
    Chih-Ming Chou
    Abstract A range of oligoaryls that contain alternating benzene,furan rings is synthesized by a rapid convergent/divergent method from the annulation of a propargylic dithioacetal and an aldehyde with a propargylic dithioacetal moiety as a substituent. These oligomers are fairly soluble in a range of organic solvents and can be easily purified by reprecipitation. The substituents on the furan rings can be varied according to the substituents in the starting propargylic dithioacetals. This route provides a useful procedure for the synthesis of alternating benzene,furan oligomers without repeated units. These furan-containing oligoaryls are highly fluorescent in the visible region and are electrochemically active. The band gaps of these oligomers appear to be less sensitive towards changes in conjugation length than those of oligofurans. [source]