Figure 2.
Circular dichroism (CD) spectra of polymers 1 and 2. The red-shift observed for P-2 with respect to P-1 is attributed to the greater length of P-2. Assembly of chiral monomer B with CuI produced enantioenriched polymer P-2. Racemic polymer 1 showed no CD signal. The corresponding UV–vis spectra are presented in Figure S2. Polymer chiral induction occurred when chiral chain-capping groups were employed, as discussed below. Chain caps of opposite handedness gave polymers with mirror-image CD spectra.