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Extinction coefficient spectrum in the region of the Qx-band for (a) c-P6·T6, (b) c-P6x·T6, (c) sEt-P11·(T6)2, (d) s-P11·(T6)2 in toluene/1% pyridine, and (e) l-P6·T6 in toluene. Arrows indicate the trend in peak intensity ratios for each compound in comparison with c-P6·T6.
