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Fig. 4 outlines the UV absorption spectra of2B-TPA in different solvents (5mM) (see also the ESI for the absorption spectra of 1B-TPA and 3B-TPA† . There were two main absorption bands in all the compounds: one located at 341– 344 nm (l1) corresponding to the absorption of the carbazolyl segment, and the other located at 368–389 nm (l2) attributed to p–p* transitions. The UV data are summarized in Table 1. It is interesting to note that the compounds show almost the samel1 values. However, thel2 and molar absorption coefficient,3, values increased with the number of dicarbazolyl triphenyl-ethylene substituents. |
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