R. E. Gerkin, P. Szerenyi
May 1, 1969
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0
Influential Citations
20
Citations
Journal
Journal of Chemical Physics
Abstract
Electron paramagnetic resonance absorption in oriented triphenylene in its lowest triplet state has been investigated in static magnetic fields below 50 G at 77°K. The orienting medium was melt‐grown single crystals of symmetric dodecahydrotriphenylene, the structure of which has been briefly investigated and compared with that of vapor‐grown crystals. The lowest triplet state of triphenylene in this host has been shown to possess lower than threefold symmetry. Taking the normal to the mean molecular plane of triphenylene to be the C axis and the mean molecular plane to be the AB plane, the results have been described by the spin Hamiltonian H = g | β | H·S + S·T·S, where S = 1, g = 2.003 (isotropic), and, at 77°K, | TCC | / hc ≡ | D | / hc = 0.133526 cm−1, σ{| D | / hc} = 0.000048 cm−1, | TAA | / hc = | TBB | / hc ≡ | E | / hc = 0.000564 cm−1, σ{| E | / hc} = 0.000048 cm−1. The triplet‐state lifetime and the angular dependence of the resonance absorption linewidths have also been studied at 77°K, and the...