The value of the "multiplicity" g .. for use in the equation kp =27rc,rn2(gl/gu)JEdii is discussed and shown to lie in the range 1 :5:g .. :5: ex>. The value best suited to most organic compounds at 77°K is shown to be gu=3. The number of emitting triplet components is shown to be readily derivable for large classes of compounds and to correlate with experiment. The effects of magnetic-field strength on triplet component energies, on phosphorescence lifetime, on phosphorescence polarization, and on g .. are calculated and shown to produce large effects in the specific case of naphthalene-ds.

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Irradiation of quinoline and 8-methylquinoline in acidic ethanol yielded the 2-and 4-ethylquinolines. Irradiation in 95% ethanol yielded the 2-a-hydroxyethylquinolines together with the corresponding 1,2,3,4-tetrahydroquinolines. Irradiation of quinoline in f-butyl alcohol yielded 2-(2-hydroxy-2-methylpropyl)quinoline. Photoalkylation did not proceed in 2-propanol but instead a low yield of a reduced quinoline dimer occurred. If 2-substituted quinolines containing a -hydrogen were irradiated in inert solvents, an elimination corresponding to ketone type II cleavage would occur with quantum yields varying from 0.014 to 0.29 depending upon the structure of the starting quinoline. This reaction was shown (by quenching studies) to proceed through an excited singlet, probably of n-* configuration. The photoelimination had a McLafferty rearrangement counterpart in the electron-impact fragmentations of the 2-substituted quinolines.

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