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The formation of the excimers was evaluated by emission decay and time-resolved emission spectra. For the trans isomers, the green emission due to the monomer showed negligible CPL signals, but the orange emission gave pronounced CPL signals. The dissymmetry factors, g-values, of the excimer CPL (glum = 0.002) were enhanced over those of the circular dichroism (gabs = 0.0002, glum/gabs = 1. The intensities of the emission and the CPL of the excimer under oxygen were very small, although those under an argon atmosphere were very strong
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