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Showing 1 to 16 of 16 for “"Radical ions"”.
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Spectroscopic Studies of Some Semiquinone Radical Ions
… and UV spectroscopic studies of semiquinone cations are reviewed. Cations of 4,4'-bipheno-semiquinones prepared by chemical oxidation of the corresponding diols and reduction of the quinones in sulphuric acid, were studied using ESR and UV spectroscopy. Oxidation of biphenyl-4,4'-diol in …
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STUDIES ON STABILIZATION OF PHOTOINDUCED RADICAL IONS IN POLYMER SYSTEMS
本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである
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Mass spectrometric characterization of peptide radical ions and implication for radical chemistry
<p>Gas-phase radical ion chemistry has attracted increasing research interest from the mass spectrometry (MS) society because it provides new capabilities in bio-analysis which often complements traditional MS methods developed from even-electron ions. Fundamental studies of biomolecule related …
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The Reaction Kinetics of Neutral Free Radicals and Radical Ions Studied by Laser Flash Photolysis
t-Butoxyl radical has been used as a chemical model for hydrogen abstractions in many enzymatic and biological systems. However, the question has arisen as to how well this reactive intermediate mimics these systems. In addressing this concern, absolute rate constants and Arrhenius parameters for …
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The electrochemical behavior and electronic structure of non- transition metal chelate radical anions
… of reversible one-electron reduction to the radical ion. These ion radicals are extremely stable, having been kept for many months at room temperature under argon atmosphere. Previous studies have indicated that the dianion radical of the substituted acetylacetonate ligand itself is extremely …
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Single layer graphene as a stable and transparent electrode for the measurement of non-aqueous electrogenerated chemiluminescence and charge transfer inverse photoemission
… permitted the stable generation of radical ions on an SLG microelectrode to be studied through Scanning Electrochemical Microscopy (SECM) in the generation/collection mode. The transparency of graphene was used to obtain accurate spectral responses in ECL: while inner filter effects …
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Application of electron spin resonance spectroscopy to problems of structure and conformational analysis: polysemiquinones and macrocyclic semidiones
… temperature, and reduction state of the radical ions. ESR spectra of diradical species in which separation between the unpaired electrons does not exceed 10 (ANGSTROM), and which nevertheless exhibit sharp ESR transitions in non-viscous media are displayed. The absence of significant line …
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Electrical and magnetic properties of organic semiconductors: Electrical conductivity and electron spin resonance studies of semiconducting, organic, charge transfer salts.
… structures which in general consist of TCNQ radical ions stacked in chains, isolated from each other by the diamagnetic cations. They are thus regarded as "one-dimensional" electrical and magnetic systems. The ESR spectra of these salts are attributed to triplet excitons showing that the …
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Applications of Mass Spectrometry to Analysis of Prodiginines, Bioactivated Methylenedianiline Intermediates, and Hypoxia Induced Changes in the Zebrafish Skeletal Muscle Proteome
… During the last two decades, its applications were dramatically extended and remarkable progress has been made in many fields, in particular, environmental and biological analyses. This dissertation focuses on identification and characterization of biologically active compounds and …
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Structures and Reactivities of Ionized and Metal Cation-Containing Acetylene Clusters
… the structures of small acetylene cluster ions, (C2H2)1-3+, mass-selected from the largest ever reported ionized acetylene clusters. The technique is also used to characterize the reaction of acetylene clusters with water in an effort to elucidate thermochemistry and kinetics of some …
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Reductive and oxidative dissociative electron transfers: transition between the concerted and stepwise mechanistic pathways
The dissociative electron transfer reactions of a series of α-epoxyketones and tetra-n-butylammonium acetate have been examined by electrochemical and computational techniques. Results for both the direct electrochemical (linear sweep voltammetry and convolution voltammetry) and indirect …
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A Radical Approach to Syntheses and Mechanisms
The critically important nature of radical and radical ion mechanisms in biology and chemistry continues to be recognized as our understanding of these unique transient species grows. The work presented herein demonstrates the versatility of kinetic studies for understanding the elementary chemical …
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Hochgradig nahgeordnete Bisdiazene und ihre Oxide
Die vorliegende Arbeit beschäftigt sich mit Wechselwirkungen hochgradig nahgeordneter, nahezu syn-periplanar orientierter Bisdiazene (N=N/N=N) und ihrer Oxide. An neuen, optimierten Substraten (Kapitel 2) werden Aspekte der Wechselwirkung im Grundzustand (Kapitel 3), im photoangeregten Zustand …
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Mechanistic, Biochemical, and Theoretical Studies of Phototoxicity and Photobluing
… path in the chemistry which then follows. Formations of allylic hydroperoxides are unlikely from a <sup>1</sup>O<sub>2</sub> ‘ene’ reaction. Instead, the dihydrobenzofuran arises by <sup>1</sup>O<sub>2</sub> oxidation facilitated by a 16° curvature of the glycocitrine ring imposed by a pyramidal …
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Stability of bioactive isoflavones and glycolytic enzymes produced by probiotic bacteria in soy based food during processing and storage
… storage at various temperatures, concentrations of individual isoflavone isomers appeared to be significantly stable (P<0.01). Interestingly, the aglycones showed much smaller degradation constants as compared to the glycosides at all the storage temperatures. Genistein and daidzein were …