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Absorbance and emission spectra of semi-flexible PPB (a and b) and rigid PPE (c and d) before and after HA complexation. A sharp absorption peak at 474 nm (a) and decreased emission intensity of the semi-flexible PPB after HA complexation supports the formation of ordered aggregation among the semi-flexible conjugated backbones. No significant changes were observed upon HA complexation of the control PPE (c and d).
