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(a) UV–vis–NIR absorption spectra of cyclic porphyrin hexamers 5b, 7, and 9 and reference linear dimer 10, recorded in CH2Cl2. (b) Cyclic (red) and square-wave (blue) voltammograms of 9 and 10 recorded in CH2Cl2 containing 0.1 M Bu4NPF6. Potentials relative to internal ferrocene (Fc/Fc+ at 0 V).
