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(a) Variations of the absorption spectra of trans-CP and its mixtures with WP5 and WP6 on irradiation by a green (540 nm) LED. (b) Variations of the absorption spectra of trans-CP/cis-CP PSS with 75% cis isomer containing no pillararenes and containing WP5 and WP6, on irradiation with an UV (370 nm) LED. Initial concentrations: [CP]0 = 2 × 10–5 M in each solution, [WP5]0 = 5.65 × 10–4 M, [WP6]0 = 1.91 × 10–4 M.
