The Phosphorescence Bands of Anthraquinone in Crystalline Solvents at 77°K
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概要
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The phosphorescence bands of anthraquinone in the solvents used in this work are all safely assigned to the π<SUP>*</SUP>→<I>n</I> bands on the basis of their short lifetimes. In <I>n</I>-paraffins (<I>n</I>-hexane, <I>n</I>-heptane, and <I>n</I>-octane), two phosphorescence bands which are close to each other are found. Considering the dependence of the relative intensities of these two phosphorescence bands on the carbon-numbers of the <I>n</I>-paraffins, it is assumed that the longer- and the shorter-wavelength bands are due to the anthraquinone molecules with the C–O bond axis parallel to and perpendicular to the longitudinal axis of the planar zig-zag form of the <I>n</I>-paraffin molecules in the <I>n</I>-paraffin crystals respectively. In chloroform and dioxane, a broad phosphorescence band shows a blue-shift relative to the corresponding band in the alkane solvents. In chloroform a sharp phosphorescence band was also observed for a solution which was rapidly cooled. This sharp band is assumed to be due to the anthraquinone molecules with a certain geometry relative to the surrounding chloroform molecules.
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