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. 2016 Nov 28;55(51):15760–15765. doi: 10.1002/anie.201609481

Figure 5.

Figure 5

Solvent‐dependent UV/Vis and fluorescence spectra of Z 1‐Me. a) UV/Vis and fluorescence spectra of Z 1‐Me (10 μm) in EtOH exhibit the spectral features of monomers. b) UV/Vis and fluorescence spectra of Z 1‐Me in CHCl3 (0.4 mm) support the presence of hydrogen‐bonded dimers and excimer luminescence. c) Fluorescence spectra of Z 1‐Me in polar solvents with different viscosities at room temperature (adjusted to matching absorbances at λ ex=424 nm); in glycerol a fluorescence quantum yield of Φ f=0.01 was determined. d) Fluorescence spectra of Z 1‐Me in EtOH at 77 K and at room temperature. Inset: Fluorescence lifetime of Z 1‐Me of about 1.7 ns (at λ=480 nm, red trace; the instrument response function is shown in black). In toluene (at 77 K), the fluorescence spectrum featured a band at λ em=660 nm with a lifetime of about 10 ns, which is consistent with the excimer emission of (Z1‐Me)2 (Figure S5 a).