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Comparison of the normalized (a) absorption and (b) fluorescence spectra of 1 and 2 in a solvent-free bulk liquid state (solvent-free) supported on a quartz plate at room temperature and in dichloromethane solution (Solution) (c=5 × 10−5 M, l=1 mm, λex=375 nm). Photographs of 2 under (c) visible and (d) ultraviolet light (365 nm).
