Chemiluminescence from reactions of N2*(A3.SIGMA.u+) with solid organic compounds at 77 K.

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The luminescence from reactions of N2(A3Σu+) with solid benzene, toluene, hexane, cyclohexane and those doped with biacetyl at 77 K has been investigated. For benzene, a broad band appeared in the range of 350–550 nm whose radiative lifetime was determined to be 2.5 s. This band was largely eliminated by addition of a small amount of biacetyl, indicating the participation of an intermediate excited state in solid benzene, i.e. triplet excitons. The emitter of the broad band was tentatively assigned to reaction products, possibly benzene isomers. For toluene, a strong appearance of benzyl radical emission was observed. With an addition of biacetyl, the elimination of benzyl emission and a strong growth of biacetyl phosphorescence were observed as for the benzene/biacetyl system. With an increase of biacetyl concentration, a remarkable red shift were observed for biacetyl phosphorescence, while no shift was observed for benzyl emission, indicating the difference of the solvent effect for these electronic transitions. No luminescence was observed for solid hexane and cyclohexane.
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