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Alcohols, acidity excitation energy

Ishii I, Hitchcock AP (1988) The Oscillator strengths for C Is and Ols excitation of some saturated and unsaturated organic alcohols, acids and esters. J Electron Spec Phen 46 55-84 Ishii I, McLaren R, Hitchcock AP, Jordan KD, Choi Y, Robin MB (1988) The a molecular orbitals of perfluoroalkanes as studied by inner-shell electron energy-loss and electron transmission spectroscopies. Can J Chem 66 2104-2121... [Pg.553]

This reaction was reported for the benzophenone photosensitized degradation of polypropylene (92),polystyrene (95), poly(vinyl alcohol) (94),polyisoprene (95,96),polyurethane (97) and polyadenylic acid (98) In solid state benzophenone also produce an extensive crosslinking of polyethylene (99-105) It has also been found that benzophenone and its derivatives caused an initial rapid oxidation,increasing with ketone concentration (70) Currently the relative importance of singlet oxygen formation in energy transfer reaction between excited benzophenone and molecular oxygen is discussed (92,104) ... [Pg.270]

The examples discussed above illustrate the utility of vibrational overtone excitation by red sunlight in atmospheric photochemistry. The low absorption cross-section of vibrational overtones limits the importance of such light-initiated chemistry. However, when reactive electronic states are high in energy (as is the case with most alcohols and acids) or when UV radiation is suppressed at high solar zenith angles, vibrational overtone initiated photochemistry has been used to explain discrepancies between measurements and model results. [Pg.11]

For 12 and 13 type dyes with various counterions in nonpolar media, electron transfers via singlet and triplet states were distinguished by flash photolysis. The rate constant for electron transfer from the first excited singlet state of 02 in methanol to benzoquinone and other suitable acceptors is = (1-3) X 10 ° M secr. Electron transfer, involving the triplet state of T2-T4, was performed with benzoquinone and ascorbic acid in alcohols. ESR results with various cyanine dyes were interpreted by electron transfer involving the superoxide radical anion. Electron transfer competes with delayed fluorescence and trans—Kis isomerization when induced by energy transfer from triplet anthracene to 13 dyes. Charge-transfer states were reported for cyanine-oxonol ion pairs. [Pg.718]


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See also in sourсe #XX -- [ Pg.84 ]




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Excitation energy

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