Fig. 4.22 Chemical structures of enantioenriched single carbo[6]helicenes 59a,b and S-shaped
double carbo[6]helicenes 59c,d [57]
Fig. 4.23 (a) Experimental and calculated ECD and CPL responses of 10, 60, and 61 ((P)
enantiomers). (b) Transition dipole moments in the ground state. Schematic representations of
electric (μ e , blue) and magnetic (μ m , red) transition dipole moments of the
1
B b band for X-shaped
and S-shaped double hexahelicenes 60 and 61, with the magnitudes relative to parent helicene 10,
calculated at the RI-CC2/def2-TZVPP level. Dashed arrows in double helicenes indicate the
transition dipole moments of component helicene units. (c) Transition dipole moments in the
excited state. Schematic representations of the electric (μ e , blue) and magnetic (μ m , red) transition
dipole moments of the
1
L b band of 60 and 61 in the excited states, with the magnitudes relative to
those for parent helicene 10, calculated at the RI-CC2/def2-TZVPP level. Adapted with permission
[23]. Copyright 2018, Nature Publishers
80
J. Crassous