Extended Data Fig. 4: Comparison of IR, absorption, emission and Raman spectroscopy of 2 and 5.
From: RETRACTED ARTICLE: Living annulative π-extension polymerization for graphene nanoribbon synthesis
a, Observed IR spectra of GNRs 2 and 5 (blue and red lines) and IR spectrum of tetramer 10 (black line) predicted by DFT calculations at the B3LYP/6-31G(d) level of theory. b, UV-vis absorption spectra of GNRs 2 and 5 (blue and red lines). c, Emission spectra of GNRs 2 and 5 (blue and red lines) excited at 320 nm. d, Raman spectra of GNR 5, obtained by excitation by a 532-nm laser.
