Charge transfer interactions in the generation of singlet oxygen O2(1-Delta-g) by strong electron donors

Article Abstract:

The efficiency of singlet oxygen generation and the quenching rate constant of the triplet state by molecular oxygen has been measured for 12 amines in cyclohexane and benzene. The average rate constant for quenching by energy transfer is 6.0 x 10(super 9) M-1 s-1 for best results. The rate constant for quenching via enhancement of internal conversion is 1.2 x 10(to the 10th power) M-1 s-1 for the same compounds. The energy transfer component of the total quenching rate constant is almost twice as fast as the maximum from the standard Porter model.

Oxygen, Charge transfer, Electron donor-acceptor complexes

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Free-radical and singlet-oxygen mobility in cotton probed by EPR spectroscopy

Article Abstract:

Spin probe EPR experiments were performed on dry cotton using 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPOL) as spin probes. Results showed that TEMPOL radicals can be polarized by the radical triplet-pair mechanism with singlet oxygen. An analysis of this polarization allowed for the estimation of the diffusion rate constant for singlet-oxygen in cotton.

Cotton (Fiber), Free radicals (Chemistry), Free radicals, Nuclear polarization, Polarization (Nuclear physics), Cotton, Active oxygen

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Orientation effects in triplet-singlet difference spectroscopy measured with absorbance-detected magnetic resonance

Article Abstract:

Absorbance-detected magnetic resonance spectra are shown to be a function of angles between optical and microwave transition moments.

Observations, Magnetic resonance

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