PubMed · 5824736
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Y E Hsia. 1969-10-30. Benzidine: a carcinogen.. https://doi.org/10.1056/nejm196910302811823
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The loss of paramagnetism of the stable free radical 4,4'-di-tert.-butyl- diphenyl-1-nitroxy during illumination of the photosensitizer meso-tetrahydroxyphenyl chlorine by light above 620 nm in the absence of oxygen has been followed by kinetic ESR spectroscopy. Addition of the spin trap alpha-(4-pyridyl-1-oxide)- N-tert.-butyl-nitrone reduces the initial rate of the disappearance of the free radical enabling to separate triplet-doublet interactions from processes between radicals stemming from the triplet sensitizer and the stable free radical. Kinetic treatment of the mechanism suggested yielded the rate constant of the triplet-doublet interaction proceeding via electron transfer being about 6% of the rate constant of the overall interaction including both energy transfer and electron transfer.
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A novel amphiphile, 4'-propoxybiphenyl-4-methyl-N,N-dimethylamineoxide, has been synthesized, crystallized (P2(1)/a, a = 9.084 A, b = 8.911 A, c = 22.460 A, beta = 96.224 degrees) and its crystal structure was determined. The amphiphile forms a bilayer in which the amineoxide oxygen of each molecule binds two water molecules. In the hydrophobic part of the bilayer the biphenyls form edge-to-face contacts, in the polar layer there is a hydrogen bonding network. The potential use of the compound as a detergent for membrane proteins has been demonstrated and the relevance of the amineoxide hydrate for other detergents discussed.