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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
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