Fig. 6: Synthesis of more sophisticated nanographenes.
From: Oxidative cyclo-rearrangement of helicenes into chiral nanographenes
a Synthesis of O6HDPT through the association of oxidative cyclo-rearrangement with Scholl cyclization. b Crystal structure of O6HDPT. c UV-vis absorption (red) and fluorescence (yellow) spectra of O6HDPT (in CH2Cl2, c = 2.0 × 10−5 mol L−1). d Synthesis of O8H’Br via oxidative cyclo-rearrangement and sequential formation of CO8H’PDI via further fusion with a PDI moiety. e Stacking of CO8H’PDI molecules in a crystal (alkyl side chains and hydrogen atoms are omitted for clarity). f UV-vis absorption spectrum of CO8H’PDI (in CH2Cl2, c = 2.0 × 10−5 mol L−1). Calculated excitation energies and oscillator strengths of CO8H’PDI-CH3 (the alkyl side chains are replaced with methyl groups for simplicity) are displayed as sticks (the first 10 excitations). g HOMO and LUMO of CO8H’PDI-CH3.
