Fig. 4. UV-vis absorption (left) and emission (right) spectra of (a) 1 (solid line) and [1-μ2-CN]– (dash line) (6.91 × 10–5 M, λex = 370 nm) and (b) 2 (solid line) and [2-μ2-CN]– (dash line) (6.22 × 10–5 M, λex = 280 nm) in CHCl3/MeOH (1/1 vol). The pictures of the solutions were taken at the same concentration. The images showing the fluorescence emission were illuminated with a hand-held UV lamp.
