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. 2016 Aug 3;8(1):142–149. doi: 10.1039/c6sc02342h

Fig. 1. (a) Synthetic routes for all of the compounds. (b and c) The crystal structures of 2 and 4 (H atoms and PF6 – anions are omitted for clarity). (d) Two-photon cross-section of L1, 1 and 2 and (e) two-photon cross-section of L2, 3 and 4 in DMF with c = 1 mM at the optimal excitation wavelength.

Fig. 1