Fig. 8: Ultraviolet–visible absorption and CD spectra.

a, Ultraviolet–visible absorption spectra of D5 and polymer P3. b, CD spectra of D5 and polymer P3. c, Ultraviolet–visible absorption spectra of D6 and polymer P4. d, CD spectra of D6 and polymer P4. e, CD spectra of (S,S)-P4 (black line; data from ref. ⁴⁰) and (R,R)-P4 (red line).