Fig. 2. (A) Absorption (dot line) and emission spectra (solid line) of R-4, 5, R-6 and R-7 in DCE, inset: photographs of R-4, R-6 and R-7 in DCE under UV light (365 nm), [4] = [5] = [6] = [7] = 2.0 × 10−5 M, λex = 280 nm (R-4) and 370 nm (5, R-6 and R-7). (B) CD and (C) CPL spectra of 6 and 7 enantiomers in CHCl3. [R-6] = [R-7] = 2.0 × 10−4 M for CD, [R-6] = [R-7] = 2.0 × 10−3 M for CPL, λex = 350 nm.
